Cambridge vs Keynesian Money Demand Approach Quiz

The Cambridge approach explains money demand primarily as a proportion of nominal income through k. Keynes went further by explicitly introducing the interest rate as a central driver of money demand, especially through the speculative motive. While Cambridge acknowledged the opportunity cost of holding money, Keynes formalized the interest rate's role and showed how it could cause money demand to be highly variable.

The answer is True. Both frameworks recognize income as an important determinant of money demand. In the Cambridge equation, desired money holdings equal k multiplied by nominal income, making income a direct driver. In the Keynesian model, higher income increases transactions demand for money. Despite their differences, both approaches share this common ground regarding the income-money demand relationship.

The speculative motive is Keynes's unique contribution to monetary theory. It holds that people deliberately hold money when they expect interest rates to rise and bond prices to fall, as a way to avoid capital losses. The Cambridge approach recognized that interest rates influence k but did not isolate or formalize a distinct speculative demand for money as Keynes did.

Keynes explicitly modeled the inverse relationship between the interest rate and money demand, particularly through speculative demand. Cambridge economists acknowledged that interest rates could affect k by changing the opportunity cost of holding money, but they did not formalize this as a separate, explicit component of money demand. Keynes's treatment was more rigorous and direct in linking interest rates to money holding behavior.

The answer is True. The Cambridge approach treats k as relatively stable, making money demand predictable. Keynes's inclusion of the speculative motive introduces instability into money demand because expectations about future interest rates can shift rapidly and unpredictably. This makes Keynesian money demand more volatile, which has important implications for the effectiveness of monetary policy.

Cambridge economists recognized that the interest rate influences how much people want to hold as cash, and this is embedded in the behavioral parameter k. However, they did not formally model this as a distinct demand component. Keynes made the opportunity cost explicit by showing how the interest rate directly determines speculative money demand, creating a formal and measurable link between rates and money holdings.

Keynes introduced the concept of a liquidity trap, where interest rates are so low that money demand becomes infinitely elastic. In this situation, all additional money injected into the economy is simply held rather than spent or invested, rendering monetary policy powerless. The Cambridge cash balance approach does not account for this extreme scenario, as it does not formally model the speculative demand that drives liquidity trap behavior.

The Cambridge approach centers on k as the income-based money demand ratio, while Keynes explicitly added the interest rate and separated money demand into three distinct motives, the most novel being the speculative motive. This makes Keynesian money demand more volatile and interest-sensitive. The Cambridge k and Keynesian liquidity preference are related concepts but are not identical or interchangeable, as Keynes's framework is broader and more formalized.

The answer is False. The Cambridge approach, rooted in classical quantity theory, supports the view that money supply changes predictably affect the price level, implying a relatively reliable role for monetary policy. Keynes challenged this view by showing that instability in money demand, especially through the speculative motive and the liquidity trap, can limit or even neutralize the effectiveness of conventional monetary policy in certain economic conditions.

A key difference between the two frameworks lies in their assumptions about stability. The Cambridge approach treats k as a relatively stable behavioral parameter, making money demand predictable. Keynes argued that money demand can be highly unstable because the speculative component depends on rapidly changing expectations about future interest rates and bond prices, undermining the predictability assumed by classical quantity theory.

Keynes's key addition to monetary theory was formalizing how expectations, particularly about future interest rates and bond prices, drive the speculative demand for money. This insight revealed that money demand is not a stable fraction of income as Cambridge assumed but can shift dramatically with changing expectations, with major implications for the effectiveness of monetary policy and the behavior of the broader macroeconomy.

The answer is False. While transactions demand in both frameworks relates to money as a medium of exchange, the Keynesian speculative motive and the Cambridge treatment of k as a broad behavioral ratio both recognize that people hold money as a store of value. Keynes in particular emphasized that money is held as an asset in its own right, not merely as a tool for completing transactions.

In the Cambridge classical framework, the price level adjusts to restore money market equilibrium. Keynes placed this role on the interest rate instead. In the Keynesian money market, when money supply and demand are not in balance, it is the interest rate that adjusts through bond market activity until equilibrium is restored. This shift from prices to interest rates as the equilibrating variable has profound implications for macroeconomic analysis.

Despite their differences, Cambridge and Keynesian approaches share important common ground. Both recognize that income drives money demand upward. Both acknowledge that the opportunity cost, primarily the interest rate, affects desired money holdings. Both analyze money as a stock that people wish to hold at any given moment. Where they differ is in the explicit treatment of the interest rate and the degree of stability assumed for money demand.

If k is stable, as the Cambridge approach assumes, monetary policy reliably affects nominal income and prices, supporting the case for rules-based monetary management. Keynes argued that when money demand is volatile due to speculative behavior, increasing the money supply may not lower interest rates or stimulate spending, making monetary policy unpredictable and sometimes ineffective, strengthening the case for using fiscal policy instead.