EC212 · LESSON 01 / 08

1. Seeing the whole economy

If one shop sells more, is the whole country doing better? Separate one business from national output, the overall price level, and employment.

Understand

What is this lesson explaining?

Macroeconomics studies aggregates and connections among households, firms, government, and the rest of the world. A buyer’s spending becomes a seller’s revenue, linking spending, production, and income.

Income and GDP are flows measured over a period, such as a year. Deposits and debt are stocks measured at a point in time. Monthly income is not the same as all the money someone holds.

YAggregate output or income per periodPOverall price level, not the price of one product

See it on a graph

The graph is right here

Read the axes and original point first. Then change one value at a time and watch the curve or point move.

The economy as a circular flowOne person’s spending is another person’s income

HouseholdsC + S + T

→spending

Firms & governmentY + income

↩income

Quick check

NO TYPING

Which is a flow?

Takeaway

Remember these two ideas

✓

Someone has a deposit balance of 40,000 baht on day 1 and earns 12,000 this month: 40,000 is a stock; 12,000 is a flow.

Common mix-upHigher GDP does not mean everyone gains equally; GDP does not fully measure leisure or environmental damage.

Assumptions and sources

This is an overview; it does not assume that higher spending always raises output.

EC212 tutoring outline: chapters 1–8 (local course outline)
Mankiw, Macroeconomics, 8th edition, chapter 2, pp. 18–20