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EC311 · Intermediate Microeconomics

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EC311 / TOPIC 04

2.3 Corners, substitutes and complements

One idea at a time · explore as you learn1 / 11

When does benefit per baht lead to a corner or a kink?

Top-down scene with coffee, a wallet, a notebook, and several curves crossing a dashed line at an orange point
VISUAL NOTE · Consumer choice Sometimes the answer is at the edge

If two pen brands are perfect substitutes, why buy both?

EC311 / GRAPHTry changing a value
  1. 01Predict
  2. 02Try
  3. 03Explain
  4. 04Challenge

Why do some preferences have no tangency?

Illustrative model numbers, not Thailand or current economic data.

For u=2X+Y, when the X price rises from 12 and the Y price stays 6, what is chosen?