liquidity preference 

*noun*; the tendency for the public to want to hold income in cash relative to its willingness to hold it as interest-bearing savings (bonds).

The liquidity preference is analogous to a supply curve for lendable funds. If the price for lendable funds--that is to say, the interest rate--is high, then the amount be be large. If the interest rate is low, then the public will be more inclined to hoard income as cash.

Income held as cash is not spent on goods and services, so if the amount increases abruptly then there will be a recession. If it is held in some interest-bearing form, then it can be spent on fixed capital, thereby increasing output and employment.

During a recession, if the liquidity preference is high, a lot of money is going to be held as cash. One could free up some cash for job-creating investment by raising interest rates, but that would eradicate a lot of business opportunities. So monetary authorities monetize debt instead, creating a new supply of credit to replace the savings lost by falling interest rates.

...An individual’s liquidity preference is given by a schedule of the amounts of his resources, valued in terms of money or of wage-units, which he will wish to retain in the form of money....

John M. Keynes, *General Theory of Employment, Interest, and Money* (1936), Ch.13

liquidity preference by Abu Yahya March 3, 2009