According to the theory of liquidity preference, holding the supply of real money balances constant, an increase in income will increase the demand for real money balances and will decrease the interest rate.
In line with the liquidity preference theory, it is state that interest rates are determined by the supply and demand of money.
It is to be noted that tightening the money supply will decrease the nominal interest rates.
Hence, according to the theory of liquidity preference, holding the supply of real money balances constant, an increase in income will increase the demand for real money balances and will decrease the interest rate.
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