The primary objective of public debt management is to minimize the cost of borrowing, which can be achieved through various strategies such as issuing debt at favorable interest rates and managing the maturity structure of the debt.

Increasing the tax rate is not a strategy for managing public debt, as it does not directly affect the government's borrowing needs or the cost of borrowing.

Issuing debt with different maturities helps to ensure that the government has sufficient funds to meet its obligations, as it allows the government to spread out its borrowing needs over time.

Public debt is the term used to describe the total amount of debt that a government owes.

Internal public debt is owed to domestic lenders, while external public debt is owed to foreign lenders.

Corporate bonds are not a type of public debt instrument, as they are issued by corporations rather than governments.

Credit spread is the term used to describe the difference between the interest rate on a government bond and the interest rate on a comparable corporate bond.

The main purpose of a debt management office is to manage the government's borrowing needs, which includes issuing debt, managing the maturity structure of the debt, and minimizing the cost of borrowing.

Debt rollover is the term used to describe the process of converting short-term debt into long-term debt.

Debt reduction is the term used to describe the process of reducing the amount of public debt.

Public debt management does not directly increase the government's revenue.

Sovereign risk is the term used to describe the risk that a government will default on its debt obligations.

The government's fiscal deficit does not directly affect the cost of borrowing, as it is the difference between the government's revenue and expenditure.

Debt refinancing is the term used to describe the process of issuing new debt to repay existing debt.

Increasing the tax rate is not a strategy for reducing the cost of borrowing for a government, as it does not directly affect the government's borrowing needs or the cost of borrowing.