May Ling is examining a piece of limestone with a hand lens. She knows that sedimentary rock has many properties. Which is a property of sedimentary rock?
A
B
C
D
It contains no minerals.
It is made of many layers.
It is made from magma or cooled lava.
It is made from the bacteria of live and dead plants.

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.