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A Study, Published in 1993, Used U Where E Is the Employment to Population Ratio of Teenagers

question 6

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A study, published in 1993, used U.S. state panel data to investigate the relationship between minimum wages and employment of teenagers. The sample period was 1977 to 1989 for all 50 states. The author estimated a model of the following type: ln(Eit)=β0+β1ln(Mit/Wit)+γ2D2i++γnD50i+δ2B2t++δTB13t+uit\ln \left( E _ { i t } \right) = \beta _ { 0 } + \beta _ { 1 } \ln \left( M _ { i t } / W _ { i t } \right) + \gamma _ { 2 } D 2 _ { i } + \ldots + \gamma _ { n } D 50 _ { i } + \delta _ { 2 } B 2 _ { t } + \ldots + \delta _ { \mathrm { T } } B 13 _ { t } + u _ { i t } where E is the employment to population ratio of teenagers, M is the nominal minimum wage, and W is average hourly earnings in manufacturing. In addition, other explanatory variables, such as the adult unemployment rate, the teenage population share, and the teenage enrollment rate in school, were included.
(a)Name some of the factors that might be picked up by time and state fixed effects.
(b)The author decided to use eight regional dummy variables instead of the 49 state dummy variables. What is the implicit assumption made by the author? Could you test for its validity? How?
(c)The results, using time and region fixed effects only, were as follows: lnEit^\widehat{\ln E _ { i t }} = -0.182 × ln(Mit /Wit )+ ...; R2= 0.727
(0.036)
Interpret the result briefly.
(d)State minimum wages do not exceed federal minimum wages often. As a result, the author decided to choose the federal minimum wage in his specification above. How does this change your interpretation? How is the original equation ln(Eit)=β0+β1ln(Mit/Wit)+γ2D2i++γnD8i+δ2B2t++δTB13t+uit\ln \left( E _ { i t } \right) = \beta _ { 0 } + \beta _ { 1 } \ln \left( M _ { i t } / W _ { i t } \right) + \gamma _ { 2 } D 2 _ { i } + \ldots + \gamma _ { n } D 8 _ { i } + \delta _ { 2 } B 2 _ { t } + \ldots + \delta _ { \mathrm { T } } \mathrm { B } 13 _ { t } + u _ { i t } affected by this?

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Digestive System

The digestive system is a group of organs working together to convert food into energy and basic nutrients to feed the entire body.

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A type of fracture of the distal radius in the forearm with dorsal (rearward) displacement of the wrist and hand.

Distal End

The part of a limb or structure furthest from the body's midline or the point of attachment.

Skeletal System

The body system composed of bones and cartilage that provides structure, support, and protection, as well as enabling movement.

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