All of the following were causes of the Great Depression EXCEPT * A) a decrease in speculation and buying "on margin"
B) a farm sector weakened by the end of WWI and a tariff on products
C) the economy in Europe
D) not enough money in circulation
E) under-consumption of products

there are two main types of historical sources: primary sources and secondary sources. a primary source is something that originates from the past. it can be a chronicle, a piece of pottery, or even a piece of glacial ice that gives us climate data about the levels of atmospheric carbon one thousand years ago.

they required less loading and unloading

explanation:

the shipping container improved shipping because it cut down on unloading time by three weeks, eliminated wasted space, and allowed ships to carry.

the answer is a) to be able to obey them.