The rate in which sound energy is averaged over time. Utilizing a decibel scale, every time the sound energy doubles, the measured level increases by 3 dB. This is the 3 dB exchange rate that most of the world uses.
An increment of decibels that requires the halving of exposure time, or a decrement of decibels that requires the doubling of exposure time. For example, a 3-dB exchange rate requires that noise exposure time be halved for each 3-dB increase in noise level; likewise, a 5-dB exchange rate requires that exposure time be halved for each 5-dB increase.
Economically defined as the intersect of the labor demand and the labor supply functions in an external market. It constitutes the wage rate that employers are willing to pay and labor is willing to accept. From a compensation viewpoint, the exchange rate defines the criterion of external equity.