Find $\mid A _ { 1 } \cup A _ { 2 } \cup A _ { 3 } \cup A _ { 4 }|$

question 121

Short Answer

Find $\mid A _ { 1 } \cup A _ { 2 } \cup A _ { 3 } \cup A _ { 4 }|$ if each set A_i has 100 elements, each intersection of two sets has 60 elements, each intersection of three sets has 20 elements, and there are 10 elements in all four sets.

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Definitions:

Multiplier

In economics, a factor by which an increase in spending leads to a greater increase in national income.

Open-market Purchase

Transactions where central banks buy securities in the open market to increase the money supply and stimulate economic activity.

Interest Rates

The cost of borrowing money or the return earned from lending money, often expressed as a percentage of the principal.

Aggregate Demand

The aggregate need for various products and services across an economy at varying price points, throughout a particular timeframe.