In a multiple regression model involving 44 observations, the following estimated regression equation was obtained. 
= 50+ 13x1 + 40x2 + 68x3
For this model, SSR = 600 and SSE = 300. MSR for this model is
Definitions:
Long-run Average Cost
The per-unit cost of production in the long term, where all inputs can be varied and economies of scale can be achieved.
Substitution
Substitution refers to the economic principle where users replace one good or service with another in response to changes in price, technology, or consumer preferences.
Product Transformation Curve
Curve showing the various combinations of two different outputs (products) that can be produced with a given set of inputs.
Diseconomies of Scope
A situation where the cost per unit increases as a company produces more types of products or services.
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