Margin
You can open an account at some of the on-line market-makers with a deposit as small as twenty-five USD ($25.00). This is significant in that a minimum trade is approximately one hundred USD. If you make a one hundred USD trade with only twenty-five USD on deposit, you are making a trade on seventy-five percent margin.
In the field of precious metals trading and investing, this is called leveraging. Often described as "controlling a multiple of your investment." However, in the field of precious metals trading, leveraged purchases generally include a "covering" loan from a financial institution which is secured by the deposit of the precious metals in a secure facility as collateral.