It would be unusual to measure the work employed for each separate activity or manufacture but it is a simple matter to determine total or the Gross Energy Consumption of a nation. So now it can be said that the Gross Energy Consumption, which is the total work done, is the real measure of national economic activity. Because of the intangible nature of energy and work, it cannot be physically transferred from one person to another so money is used to represent the exchange of energy. The exchange of work is acknowledged or recorded by using money. The money that is paid for a good or service is a way of representing the amount of energy or work that a purchaser is prepared to exchange for that good or service.
Wages paid to employees are energy credits given in return for work input.
Profits and savings and capital investment too, are energy credits. Gross Domestic Product is the money value of all the activities and goods produced by a nation and thus is the money equivalent of all the work done or is the equivalent of the Total Energy Consumption . Where, e is Total Energy Consumption, G is GDP and m is a multiplying factor. This is the true purchasing power of a currency no matter what circumstances pertain . If a trader or a company wishes to purchase a currency in order to complete a transaction then the price that is paid for the currency has no influence on the true value and m Joules of energy or work will still represent one unit of money U .