Final answer:
Investment drives the demand for loanable funds; a decrease in interest rates results in increased demand. If the supplied quantity is greater than the demanded quantity due to high-interest rates, a surplus occurs, prompting lenders to lower rates towards equilibrium.
Step-by-step explanation:
Investment is the source of the demand for loanable funds. As the interest rate falls, the quantity of loanable funds demanded increases. Suppose the interest rate is 5.5%. Based on the information provided, if the interest rate is above the equilibrium, such as 21%, the quantity of loanable funds supplied at that rate is greater than the quantity of loanable funds demanded. This results in a surplus of loanable funds.
This surplus would encourage lenders to lower the interest rates they charge, thereby increasing the quantity of loanable funds demanded and decreasing the quantity of loanable funds supplied, moving the market toward the equilibrium interest rate. The exact equilibrium interest rate is not provided, but it would be lower than the current rate of 5.5% if we assume that there is still a surplus at this rate.
An increase in the amount of available loanable funds implies that there are more suppliers in the market, which would result in a downward pressure on the price of borrowing, leading to a lower equilibrium interest rate than the current one.