Economics is the science of confusing stocks with flows.
Michal Kalecki
What is the market of loanable funds? It is supposed to be the market that equilibrates the demand for savings with the demand for investment. But if such a market existed, it would be a market for flows, not stocks.
However the bond market is a market of stocks. The capital market is a market for stocks. Both bonds and capital persist across periods and can be re-sold. Everyone who owns a bond (or who owns capital) is a potential supplier of bonds or capital at some rate. Everyone is also a potential demander of bonds or capital at some rate.
As the interest rate changes, some suppliers become demanders, so that at equilibrium, supply (of the stock) is equal to the demand (for the stock). This is the equilibrating process for stocks that can be re-sold by their current owner in any period.
But lending and investment are the derivatives of these quantities with respect to time — they are flows.
Can the interest rate equilibrate both flows and stocks?
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