To solve the problems that adjustment is made only within a bonus, an exchange risk cannot be covered completely, and the eagerness of people to buy falls disadvantageously if lump sum money is drastically reduced although a domestic wage and a price are determined conventionally on the basis of a profit for an applicable period and partially in accordance with currency movements, and that, on the other hand, it is difficult to cope with a change in business environment because once raised salary is hardly adjusted due to a contract.

This domestic price linked with an exchange rate guides business to avoidance from the exchange risk by fluctuating a domestic wage and a domestic product price so as to make them link with the exchange rate.