Macro money

Introduction to Money in Economic Models

  • Introduced the concept of money in analyzing models previously using real variables (e.g., consumption in coconuts, real wages, and real rental rates of capital).

  • Transitioning to nominal values where economic entities will deal with nominal wages and prices (e.g., euros, dollars).

Implication of Money in Economic Models

  • Question raised: What changes occur when integrating money into models?

    • Macro Effects of Monetary Policy:

      • Expansionary monetary policy leads to an increase in money supply.

      • Contractionary monetary policy leads to a decrease in money supply.

Quantity Theory of Money

  • Recap of quantity theory:

    • Formula: Ms (Money Supply) = Pd (Prices) x Y (Income)

    • If the central bank increases the money supply with constant velocity and output, long-term effects will show no change in real values such as real GDP and consumption.

    • Monetary policy primarily affects nominal values (prices), not real values during the long run.

Conceptualizing Monetary Policy Effects

  • Experiments in Monetary Policy Effects:

    • First Experiment (Expansionary Policy):

      • Families visit an amusement park; workers hired based on expected economic activity.

      • Increased demand leads to inflation as prices adjust quickly, resulting in nominal price increases but no change in real consumption or activity.

    • Second Experiment (Contractionary Policy):

      • If the money supply decreases, families react by reducing spending leading to a recession.

      • Operators cut back employment as demand falls, resulting in higher ticket prices but lower economic activity.

Introducing Money in the Economy

  • Importance of considering a central bank in economic models.

  • Sydowski's Model for Money Demand:

    • Demand for money can be modeled based on utility derived from holding money.

    • Three main approaches for understanding money demand:

      1. Utility-Based Approach: Individuals demand money because they derive satisfaction from holding it.

      2. Transactional Approach: Money is needed for transactions due to its liquid nature. Non-liquid assets are insufficient for daily purchases.

      3. Portfolio Diversification: Money is one of many assets individuals hold to maintain a diversified investment portfolio even though it yields no interest.

Revisiting the Two-Period Economy with Money

  • The model consists of consumers who derive utility from both coconuts and money.

  • Introduction of monetary authority that supplies money to consumers.

  • Inflation is defined and measured, informing dynamics between nominal and real interest rates.

Equilibrium and Economic Activity

  • Analysis of how introducing money alters equilibrium conditions without changing real consumption/savings behavior.

  • Clarified that adding money into the economy does not impact aggregate consumption rates.

  • Final focus on consumer behaviors, equalization of saving and consumption, and resolving the interaction between nominal prices and money supply.

Conclusion

  • Money Neutrality: In this model, introducing new money does not alter economic activity or real consumption due to the proportionality of money supply increase and prices, maintaining an overall neutrality regarding economic changes.