LPP deals with solving problems which are linear . ex: simlpex method, big m method, revised simplex, dual simplex.
NLPP deals with non linear equations ex: newton's method, powells method, steepest decent method
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non-linear costs and revenues are ignored by the model
Linear programming, especially in economics is vital for being able to make accurate estimates of goods output, costs and stock levels needed to carry out certain tasks. It is best to assume that the conditions do not change drastically.
Along a linear demand curve elasticity varies from point to point of the demand curve with respect to different price, but slope is constant
It takes out the personal angle in decision making.
To add a linear time trend in Stata, you can use the "regress" command with the time variable included as a predictor. This allows you to estimate the relationship between time and your outcome variable.