Using the model Y = Xβ + U,and the extended least squares assumptions,derive the OLS estimator 
.Discuss the conditions under which 
X is invertible.
Definitions:
Marginal Land
Land that produces little yield or economic value due to poor quality, location, or other factors, making it the least productive for agricultural use.
Rents
Payments made periodically by a tenant to a landlord in exchange for the use of land, a building, or other property.
Supply of Loanable Funds
The total amount of funds that lenders are willing to loan at a given interest rate in an economy.
Elastic
Describes a situation in economics where the quantity demanded or supplied of a good changes significantly in response to changes in its price.
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