Traditional supply and demand economics implies open and equal information for buyer (employer) and seller (employee). For goods and services, there is transparency in the price of a product. In the labor relationship, the buyer (employer) holds almost all of the information that impacts price (wages).
- Employers know how many candidates they have for a position.
- Employers know what they have paid for that position in the past.
- Employers can often afford to wait longer to decide.
It should also be noted that the US taxes wages at a higher rate than investment or dividend earnings. This may distort the market as certain income streams are incentivized over others.