Marx's exploitation theory is wrong because:
1) the abstract conceptual framework, which states that the final wage of workers = the worker's income from labor - profit, is wrong. The actual formula is worker's income = demand for labor/supply of labor.
2) Marx's formula for price, which stated that price = quantity of labor time to produce the product/quantity of labor time to produce a dollar's worth of gold was wrong. The actual formula is price = demand/supply.
3) Marx's version of the iron law of wages, which states that wages will tend to equal subsistence, is wrong. Wages in a free market economic system are able to increase without limit.
Exactly, it goes against everything that occurs naturally. Supply and demand are a fluid concept and Marxism is static.