Can you guys me on my social studies homework ?

1. People didn't have to trade goods.

Explanation:

With a unitary currency, trading goods became easier. It also allowed people to have a standardized form of trading, where each commodity had the same value for everyone. Also, money it made possible for people not to have goods and still trade and buy stuff. It also allowed them not to carry their commodity around when they wanted to trade. Money was a precondition for open market and competition. Money was a starting point for credit system and banking.

2.

Paper money was easier to handle and carry around. It is also fictional because, it has no other value, but the value people gave it in order to recognize it as an official form of money. It is originally issued by banks, and is a legal requirement for buying commodity. First paper money originated in South-East Asia and China. A disadvantage for paper money is that it makes inflation possible, which is made financial crises, because the money loses all of its value.  

3.

The best thing to put on the coin is a symbol of the state - a government's house, or some former leader - founding father of the country. This symbol should be on the back of a coin, while on the front there should be the amount of money this coin represents. While coins nowadays represent small amounts of money, there should be a denomination of 1 or 2 on the front side of the coin.

experiments.

surveys.

questionnaires.

interviews.

case studies.

participant and non-participant observation.

observational trials.

studies using the delphi method.

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