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A More “Economic” Example

A More “Economic” Example. Public finance economists are interested in the productivity of government spending Two largest components of local spending are schools and public safety Will hiring more police reduce crime? . Let y=crime rate (crime per person) Let x=police employed per person

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A More “Economic” Example

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  1. A More “Economic” Example • Public finance economists are interested in the productivity of government spending • Two largest components of local spending are schools and public safety • Will hiring more police reduce crime?

  2. Let y=crime rate (crime per person) • Let x=police employed per person • Interested in estimating the gradient • dy/dxhow will crime change when a city hires more police

  3. Collect data on a cross section of cities • 61 cities with populations in excess of 250K • Estimate basic model Yi = β0 + β1Xi + εi • What do you think is the most frequent sign (+ or -) on police?

  4. Crime Rank 1. Detroit 2. Memphis 3. Baltimore 4. Nashville 5. Philadelphia 6. Washington, DC 7. Boston Rank of Police force size 10 27 6 25 8 1 9 Highest violent crime rates

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