In cross sectional research, a researcher compares multiple segments of the population at the same time.
<h3>What is cross sectional research?</h3>
It is a type of research design in which data are collected from many different individuals or segments.
This data are analyzed at one specific point and time.
Therefore, a cross sectional researcher compares multiple segments of the population at the same time.
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This is the best I got: The best way to prove that slavery was in fact an inefficient market because the assumptions of Fogel and Engerman are weakly based and in some cases rather short-sighted.
Answer: " warehouses for the mentally ill"
Explanation: