Explain the historical background of psychology.

sychology was a branch of the domain of philosophy until the 1860s, when it developed as an independent scientific discipline in Germany.[2] Psychology as a field of experimental study began in 1854, in Leipzig Germany, when Gustav Fechner created the first theory of how judgments about sensory experiences are made and how to experiment on them. Fechner's theory, recognized today as Signal Detection Theory foreshadowed the development of statistical theories of comparative judgment and thousands of experiments based on his ideas (Link, S. W. Psychological Science, 1995). 

Explanation:

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porter is writing economic history because he is focusing on the cost of developing vaccines.

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