What made the Lydians rich? why don't they have these questions on here so now I have to ask this question so everybody can tell me the answer cuz I don't know

What does this quotation from the introduction of thedeclaration of independence do?

Mankiw attributes – chapter 1 and his 10 principles – differences in living standards within a countryover time and across countries at a moment in time to: a. the presence or absence of inflation and unemployment.b. the allocation of resources between private markets and the public sector.c. those that have dealt successfully with the efficiency v. equality tradeoff and those that haven’t.d. differences in productivity.e. ones that think at the margin and respond to incentives and those that don’t.

In which two ways was galileo’s improved telescope useful during the scientific revolution?