China demanded that Europeans pay for goods with gold or silver because they were not interested in any of European trade items. It was considered as many scholars that silver trade was the mark of starting of global economy.
When cash is contributed to a political party with no limits attached to the amount that can be received, this is known as a "soft money<span>" contribution.</span>
Supply and Demand refers to the amount of products/resources available versus the amount of demand there is for that product/resources. The amount of capital that the product/resource is worth then fluctuates dependent on demand and flow of the product/resource.