Can someone help me if your kind enough

How did renaissance scientific advances have artists to make more realistic art

In a market economy, what does a producer mean when it asks, "is there a market for my products? is there a place where we can sell our products? " "ls our product being made more cheaply overseas? " will consumers need and want to buy our products? " will the government support demand for our products? "

Why is it economically necessary for the east germans to build berlin wall