11.   In exchange for using the channel tunnel, Eurostar pays Eurotunnel a sliding fee based on the number of passengers carried.

12.   In addition, the company will be able to charge fees based on the value of a transaction, rather than by the amount of time spent on it.

13.   Insurance companies pay brokers fees based on volume and profitability.

14.   Increasingly, financial advisers are charging fees based on the assets they manage, as opposed to charging commissions for each transaction they make.

15.   Mutual fund companies charge fees based on a percentage of your holdings to cover management costs, administrative expenses and other operating costs.

16.   Now Magellan is in the midst of an important year because Fidelity funds earn performance bonus fees based on returns over rolling three-year periods.

17.   Other firms calculate money management fees based on net asset values, the market value in an account after margin loan balances have been subtracted.

18.   Sliding fee based on ability to pay.

19.   Steer clear if the fee is calculated based on the size of your income rather than the complexity of your return.

20.   Such exemptions enable hedge funds to use a wide variety of investment techniques, such as active short selling, and to charge fees based on performance.