What's macro-psychology? Do you mean group-psychology?
Economics is the study of a particular value system within society, that value system being the monetary/capital one. Human psychology comes into play (both at the individual and group level) because human evaluation and action is involved.
Group psychology vs egregore psychology. The difference is whether you are paying attention to individual desires in aggregate, or whether you are attributing desires to the collective entity that no single individual has.
Economics is the study of a particular value system within society, that value system being the monetary/capital one. Human psychology comes into play (both at the individual and group level) because human evaluation and action is involved.