Answer:
Because of the Statute of Frauds
Explanation:
Dollar Value Motors asks Estimable Bank for a loan to increase its vehicle inventory. Estimable requires Flair, Dollar Value's president, to sign a personal guaranty to pay the debt if Dollar Value defaults. Meanwhile, to buy a pick-up truck from Dollar Value, Gina asks Harper to co-sign a credit application. If Flair is a guarantor, then the guaranty is required to be in writing because of THE STATUTE OF FRAUDS
I believe the answer is theoretical model
A theoretical model is the foundation that could be held to support a certain theory for a certain research or study.
From the example above, the study is build on a foundation that both behavior and environmental factor could affect the subjects' overall health
Can you take a clearer pic please
Mass production facilitates the efficient production of a large number of similar products