Multiply the matrices. 
Definitions:
Great Depression
A severe worldwide economic downturn during the 1930s, characterized by massive unemployment and deflation.
Ph.D.
A Ph.D. is a Doctor of Philosophy degree, a postgraduate academic degree awarded by universities, signifying advanced research and scholarly achievement in a specific field.
Employed
The condition of having paid work or being engaged in an activity or job that generates income.
Labor Force
The total number of people employed or actively seeking employment in a given economy.
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