Money, Banking and Inflation (অর্থ, ব্যাংকিং ও মুদ্রাস্ফীতি)

Before the invention of monetary instruments, primitive societies organized economic activity through the Barter System (or the C-C Economy, representing Commodity-for-Commodity exchange). In a barter economy, goods and services are directly exchanged for other goods and services without any intermediate numeraire. However, as human civilization expanded, direct commodity exchange broke down due to five insurmountable structural obstacles:

1. Lack of Double Coincidence of Wants: Exchange can occur only if the exact surplus commodity possessed by individual $A$ is desired by individual $B$, and simultaneously the surplus of individual $B$ is desired by individual $A$. As William Stanley Jevons noted, the probability of finding two individuals with reciprocal mutual wants in a complex society is astronomically low, causing massive transaction costs and wasted time.
2. Absence of a Common Measure of Value: Under barter, there is no single standardized unit in which the values of all goods can be denominated. In an economy with $n$ commodities, establishing relative exchange values requires determining $\frac{n(n-1)}{2}$ separate exchange ratios. For just 100 commodities, 4,950 distinct exchange ratios must be calculated and remembered!
3. Difficulty of Deferred Payments (Future Contracts): Credit transactions, loan repayments, and long-term contracts are virtually impossible under barter. If a loan is borrowed in wheat or cattle, repayment years later faces disagreements over quality grades, physical perishability, and severe commodity price volatility.
4. Indivisibility of Certain Commodities: Many high-value commodities cannot be divided without destroying their intrinsic utility. If an individual owns a live cow and desires to acquire only two bushels of wheat, the cow cannot be physically halved without slaughtering it, paralyzing small-scale transactions.
5. Difficulty and Cost in Storing Wealth (Store of Value): Storing wealth in the form of physical commodities (grain, livestock, cloth) entails substantial physical storage costs, high risk of spoilage or pest infestation, physical depreciation, and vulnerability to natural hazards.

To overcome these barter impediments, human society evolved money. Economists offer two celebrated definitions:

• Francis Amasa Walker: "Money is what money does." This functional perspective asserts that whatever object performs the core functions of medium of exchange, measure of value, and store of value is money.
• Geoffrey Crowther: "Money can be defined as anything that is generally acceptable as a means of exchange, and at the same time, acts as a measure and as a store of value."

The functions of money are systematically categorized into Primary, Secondary, and Contingent functions:

• Fiat Money: Currency notes and coins issued under the sovereign authority and decree ("fiat") of the government and central bank. Fiat money possesses no intrinsic commodity value (unlike gold or silver coins); its value stems exclusively from state authorization and public trust.
• Fiduciary Money: Instruments accepted as a medium of exchange based on mutual trust and confidence between payer and payee, without sovereign legal compulsion (e.g. bank cheques, drafts, bills of exchange). A shopkeeper cannot be legally prosecuted for refusing payment by cheque.
• Legal Tender (Unlimited vs Limited): Money that economic agents are legally bound to accept in settlement of all debts and financial obligations within a jurisdiction.
  • Limited Legal Tender: Money that can be legally tendered up to a statutorily defined maximum sum. In India, 50-paise coins are legal tender up to a maximum limit of ₹10 (Coinage Act, 2011).
  • Unlimited Legal Tender: Money that must be accepted in payment of debts of any magnitude whatsoever. In India, all currency notes issued by the RBI (₹10, ₹20, ₹50, ₹100, ₹200, ₹500) and coins of ₹1, ₹2, ₹5, ₹10, ₹20 are unlimited legal tender.

The Demand for Money refers to the desire of individuals and business firms to hold purchasing power in the form of liquid cash balances (currency and checkable bank deposits) rather than illiquid interest-bearing financial assets (such as government bonds, debentures, or fixed deposits) or physical assets (real estate, gold). Holding money confers absolute liquidity ($0\%$ transaction cost to convert into goods), but incurs an opportunity cost equal to the foregone nominal rate of interest.

In his seminal work The Purchasing Power of Money (1911), American economist Irving Fisher formalized the Classical Quantity Theory of Money through the famous Equation of Exchange:

When expanded to explicitly incorporate commercial bank credit deposits ($M'$) and their velocity ($V'$):

Where the variables represent:

• M: Total quantity of legal tender money in circulation.
• V: Transaction velocity of circulation of currency (average number of times a unit of currency changes hands in a year).
• M': Total volume of commercial bank credit/demand deposits.
• V': Velocity of circulation of bank deposits.
• P: General price level of goods and services.
• T: Total physical volume of transactions conducted during the accounting year.

Economists at Cambridge University (Alfred Marshall, A.C. Pigou, D.H. Robertson, and early J.M. Keynes) criticized Fisher's formulation as mechanical and focused on money as a store of value rather than merely a transaction pipeline. They formulated the Cambridge Equation:

Where $Y$ is real national output, $P$ is the price level (so $P \cdot Y$ is nominal national income), and $k$ is the Cambridge Constant: the fraction of nominal annual national income that the public chooses to hold in the form of liquid cash balances ($k = \frac{1}{V}$).

In The General Theory of Employment, Interest and Money (1936), J.M. Keynes revolutionized monetary theory by asking: Why do people hold cash when they could earn interest by holding bonds? He identified three fundamental motives:

1. The Transactions Motive ($M_t$ or $L_1$):

   Arises because income is received intermittently (e.g. monthly salary), whereas consumption expenditures occur continuously every day. Cash balances are held to bridge this payment interval. Transaction demand depends directly on national income ($Y$):

   L₁ = f(Y), where dL₁/dY > 0
2. The Precautionary Motive ($M_p$):

   Arises from the human desire to provide for unforeseen emergencies, unexpected medical crises, natural disruptions, or sudden advantageous business bargains. Like the transaction demand, precautionary cash demand is primarily determined by the level of income ($Y$). Economists group them together as: $L_1(Y) = M_t + M_p$.

3. The Speculative Motive ($M_{sp}$ or $L_2$):

   This was Keynes' most revolutionary contribution. The speculative demand refers to holding cash to exploit anticipated changes in future interest rates and bond prices.

   The Inverse Relation Between Bond Prices and Interest Rates:
   A perpetual bond paying a fixed coupon of $R$ per year has a market price of $P_b = \frac{R}{r}$.

   • When current interest rate $r$ is high, bond price $P_b$ is low. Speculators anticipate interest rates will fall and bond prices will rise $\implies$ they buy bonds to earn capital gains and hold minimal cash. Hence, speculative cash demand is low.
   • When current interest rate $r$ is low, bond price $P_b$ is high. Speculators expect interest rates to rise and bond prices to crash $\implies$ they sell bonds to avoid capital losses and hoard liquid cash. Hence, speculative cash demand is high.

   Therefore, speculative demand is an inverse function of the market interest rate: $L_2 = f(r)$, with $\frac{dL_2}{dr} < 0$.

Money Supply is a stock concept defined as the total stock of money (currency notes, coins, and checkable deposits) held by the general public (households, business enterprises, and non-bank institutions) at a specific point in time in an economy.

In April 1977, the Reserve Bank of India adopted four official measures of money supply arranged in descending order of liquidity:

High-Powered Money ($H$)—also termed Reserve Money ($M_0$) or the Monetary Base—is the total monetary liability of the Reserve Bank of India and the Government of India. It constitutes the foundation of the entire monetary system:

Let us define two structural behavioral ratios:

• Currency-Deposit Ratio ($c$): The ratio of currency held by the public to demand deposits ($c = C / DD$).
• Reserve-Deposit Ratio ($r$): The fraction of total deposits that banks hold in reserves ($r = R / DD$).

Now express total money supply ($M_1$) and high-powered money ($H$) in terms of demand deposits ($DD$):

Dividing $M_1$ by $H$ gives the Money Multiplier ($m$):

Because $r < 1$, the money multiplier is strictly greater than 1 ($m > 1$). Every injection of ₹1 of high-powered money by the RBI expands the total money supply in the economy by ₹$m$.

According to Section 5(b) of the Indian Banking Regulation Act (1949), Banking is defined as: "accepting, for the purpose of lending or investment, of deposits of money from the public, repayable on demand or otherwise, and withdrawable by cheque, draft, order or otherwise."

A commercial bank is a profit-seeking business corporation. Its profits originate from the Spread—the positive interest rate margin between the higher lending rate charged to borrowers and the lower borrowing rate paid to depositors.

Understanding bank credit requires distinguishing two fundamental deposit types:

• Primary (Passive) Deposits: Arise when a customer physically deposits cash into their bank account. The bank is merely a passive receiver; primary deposits represent an initial injection of currency into the banking system without generating new aggregate money.
• Derivative (Active) Deposits: Arise when a commercial bank sanctions a loan. Banks do not lend out physical currency notes. When an entrepreneur borrows ₹5,00,000 to purchase machinery, the bank opens a credit account in the borrower's name and credits the balance. This book entry represents a brand-new derivative deposit. As celebrated economist Hartley Withers stated: "Loans create deposits."

Commercial banks can safely lend multiples of their cash reserves because of two historical empirical facts:

1. All depositors never withdraw all their cash deposits on the same day.
2. New cash deposits enter the banking system daily as previous loans are repaid.

Therefore, banks are only required to retain a legally mandated fraction of their total deposits in liquid reserves—known as the Legal Reserve Ratio (LRR), determined by the Central Bank ($LRR = CRR + SLR$).

Suppose an individual deposits an initial primary cash sum of ₹10,000 in Bank A:

Total deposits represent an infinite geometric progression series with first term $a = \Delta P = 10,000$ and common ratio $r = (1 - LRR) = 0.80$:

1. Currency Drainage (Cash Leakage): In reality, borrowers withdraw a portion of loans in physical currency for informal transactions. This leaks reserves out of the banking loop and sharply truncates subsequent multiplier rounds.
2. Excess Reserves: During economic recessions or banking stress, risk-averse commercial banks voluntarily hold excess reserves above the legal requirement rather than lending out their entire surplus.
3. Availability of Creditworthy Borrowers: Banks cannot force credit upon the public. If economic agents lack sound business proposals or collateral, credit creation stalls.
4. Central Bank Monetary Policy: The RBI continuously regulates the credit volume by adjusting CRR, SLR, and Repo Rates.

A Central Bank is the apex non-profit financial institution of a nation entrusted with issuing national currency, regulating the commercial banking system, managing foreign exchange reserves, and conducting monetary policy in the public interest. In India, the apex monetary authority is the Reserve Bank of India (RBI), established on April 1, 1935 under the Reserve Bank of India Act, 1934 and nationalized on January 1, 1949.

1. Bank of Issue (Sole Currency Monopoly): Under Section 22 of the RBI Act, the RBI has the exclusive statutory authority to issue currency notes of all denominations (₹10 to ₹500). Under the Minimum Reserve System (adopted in 1956), the RBI maintains a minimum backing of ₹200 crores in assets, of which at least ₹115 crores must be in gold bullion and the remaining ₹85 crores in foreign securities. (Note: One-rupee notes and all metallic coins are minted by the Ministry of Finance, Government of India, but circulated by the RBI).
2. Banker, Fiscal Agent and Advisor to the Government: Manages public debt, maintains cash balances of the Central and State Governments, conducts foreign exchange transactions, and provides Ways and Means Advances (WMA) to manage temporary receipt-disbursement mismatches.
3. Banker's Bank and Supervisor: Commercial banks maintain their statutory cash reserves with the RBI. The RBI conducts on-site inspections, licenses new branches, and enforces prudential norms.
4. Lender of Last Resort: When a solvent commercial bank faces severe liquidity panics or depositor bank runs and cannot raise funds from the inter-bank money market, the RBI steps in to advance emergency liquidity against eligible collateral, safeguarding public trust and preventing systemic financial contagion.
5. Custodian of Foreign Exchange Reserves: Preserves and manages the nation's foreign exchange reserves (US Dollars, Euros, Gold, SDRs) and intervenes in foreign exchange markets to smooth out excessive volatility in the Indian Rupee exchange rate.
6. Controller of Money Supply and Credit: Uses monetary policy instruments to balance inflation targeting with sustainable economic growth.

The RBI controls bank credit through two distinct branches of monetary policy:

Inflation is defined as a persistent, appreciable, and generalized increase in the overall price level of goods and services in an economy over an extended duration, resulting in a continuous erosion in the purchasing power of money. Economists distinguish inflation by two strict criteria:

• A rise in the price of one or two individual goods (e.g. seasonal tomato price hikes) is not inflation. Inflation is an aggregate macroeconomic phenomenon involving the general price level ($P$).
• A one-time transitory jump in prices (e.g. following a sales tax revision) is not inflation. The price rise must be sustained and persistent over successive quarters.

• Creeping Inflation: Prices rise very slowly at an annual rate of below $3\%$. Generally viewed by macroeconomists as a healthy, necessary lubricant that stimulates business profits and investment without disrupting household budgets.
• Walking / Trotting Inflation: Annual price increase between $3\%$ and $10\%$. Serves as an urgent warning signal for central bankers to tighten monetary policy before expectations de-anchor.
• Running Inflation: Prices accelerate rapidly at $10\%$ to $20\%$ per annum, severely eroding the real standard of living of working families.
• Galloping / Hyperinflation: Catastrophic price increases of over $20\%$ per month or hundreds/thousands of percent annually (e.g. Weimar Germany 1923, Zimbabwe 2008, Venezuela 2018). Currency completely loses its store of value and medium of exchange functions, causing monetary collapse and a return to primitive barter.

Inflation acts as an arbitrary, regressive tax that fundamentally redistributes wealth between socio-economic classes:

Taming persistent inflation requires a coordinated tripartite macroeconomic framework combining monetary, fiscal, and administrative interventions: