Which one of the following is likely to be the most inflationary in its effect?

The correct answer is Creation of new money to finance a budget deficit.

Step-by-Step Explanation:

1. Understanding Budget Deficit Financing:
A government faces a budget deficit when its expenditure exceeds its revenues. To bridge this gap, the government can use various financing methods, each having a different impact on the money supply and aggregate demand in the economy.

2. Analyzing the Options:

Option 1: Repayment of public debt
When the government repays public debt, money flows back to bondholders. However, this is usually balanced by previous revenue collection or reduced future spending and does not inherently expand the base money supply directly for deficit financing.

Option 2: Borrowing from the public to finance a budget deficit
When the government borrows from the general public (by issuing government bonds), purchasing power is transferred from individuals/institutions to the government. Since money is simply absorbed from private hands and spent by the government, the overall money supply in the economy remains largely unchanged. Hence, its inflationary impact is minimal.

Option 3: Borrowing from commercial banks to finance a budget deficit
Borrowing from commercial banks can lead to credit expansion, but it is limited by the banks' reserve requirements and existing liquidity. While it can be somewhat inflationary, it is constrained by the banking system's credit creation mechanisms.

Option 4: Creation of new money to finance a budget deficit (Deficit Financing / Monetization of Debt)
When the central bank prints new currency or creates fresh bank reserves to buy government securities (often called "monetizing the debt"), it directly injects brand-new high-powered money into the economy. This expands the monetary base without reducing purchasing power anywhere else in the private sector. When money supply increases significantly faster than the output of real goods and services, it leads to a classic inflationary pressure where "too much money chases too few goods." Therefore, this method is the most inflationary among all choices.

Conclusion:
Directly printing or creating new money increases the total aggregate demand rapidly without an immediate increase in aggregate supply, making Creation of new money to finance a budget deficit the most inflationary option.