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October 11, 2026 

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GOOD TYPES: We can identify four different types of goods based on two key characteristics -- rival consumption and excludability. Private that are rival in consumption and easily subject to the exclusion of nonpayers. Public goods that are nonrival in consumption and the exclusion of nonpayers is virtually impossible. Near-public goods that are nonrival in consumption and easily subject to the exclusion. Common-property goods that are rival in consumption and not easily subject to the exclusion.

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FOUR-SECTOR INJECTIONS-LEAKAGES MODEL

A variation of the Keynesian injections-leakages model that adds the foreign sector to the three domestic sectors--the household sector, the business sector, and the government sector. This variation adds the foreign to the three domestic sectors (household, business, and government) in the three-sector model and provides an alternative to the four-sector aggregate expenditures (Keynesian cross). It provides the complete Keynesian representation of the macroeconomy, including the export-import interaction between the domestic economy and the foreign sector. Equilibrium is identified as the intersection between the S + T + M line and the I + G + X line. Two related variations are the two-sector injections-leakages model and the three-sector injections-leakages model.

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APLS

BLUE PLACIDOLA
[What's This?]

Today, you are likely to spend a great deal of time going from convenience store to convenience store hoping to buy either decorative garden figurines or a wall poster commemorating last Friday (you know why). Be on the lookout for jovial bank tellers.
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This isn't me! What am I?

The average bank teller loses about $250 every year.
"Every generation of Americans needs to know that freedom exists not in doing what we like, but in having the right to do what we ought. "

-- Pope John Paul II

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