"Time fixed effects control for unobserved variables that are the same acrossentities but vary over time". Is this statement true?

Estimate the following model: purchase = β0 + β1traditional + β2aggregator + β3substack

Pls help with below homework question )-

I need the answer as soon as possible

Match the terms in the first column with the appropriate definition in the second column.

A(n) variable is calculated from within the model. A(n). endogenous; endogenous endogenous; exogenous exogenous; endogenous exogenous; exogenous none of the above variable can never be taken as given.

1. A Travel-Cost Method Now it is time for your first consulting job as an environmental economist. The Forest Service would like to know whether they should preserve some national forest land, previously slated to be logged, for hiking. You are helping do a travel-cost analysis to estimate the annual benefits of hiking in this area. Survey data has been gathered from 500 hikers who visited the forest last year. This forest did not charge an entrance fee. Using a statistical technique called regression analysis, you have controlled for differences in income, employment status, age, and other important factors that might affect the number of hiking trips taken. Taking these factors into account, you have developed the following relationship: Zone 1 2 3 Population in zone 1,000 3.000 2,000 Cost Per Hiking Trip Per Person 20 40 80 Hiking Trips Taken Per Zonal Person Per Year 8 6 2 where cost includes gas, tolls, fares, hotels, entry fees, and the value of time spent traveling. a. Graph a…

Shrinkage estimators     are unbiased.     are BLUE (i.e. Best Linear Unbiased Estimator).     in general have a causal interpretation.     shrink the estimator.

Use appropriate model(s) to analyze the impact of COVID-19 pandemic on a country's economy in the short-run and long-run. Graphical analyses is also required