这篇博客探讨了A-Level经济中的预算约束概念，包括如何计算在不同收入和价格下购买的商品数量，以及预算约束线的斜率和变化。通过Hurley的案例，解释了当收入和商品价格变化时，预算约束如何调整。此外，还涉及了正常品和劣等品在收入增加时的需求变化，并要求读者通过图表分析收入增加对最优商品组合的影响。
知识点：Budget Constraint
例题
Question: Budget Constraint
Hurley’s income: $1200, Prices: PF = $4 per fish, PM = $1 per mango
A. If Hurley spends all his income on fish, how many fish does he buy?
B. If Hurley spends all his income on mangos, how many mangos does he buy?
C. If Hurley buys 100 fish, how many mangos can he buy?
D. Plot each of the bundles from parts A – C on a graph that measures fish on the horizontal axis and mangos on the vertical, connect the dots.
E. Show what happens to Hurley’s budget constraint if:
1. His income falls to $800.
2.&
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