Correctly Understand Marx's Theory of Labor Value by Starting with Basic Theory

With the discussion of Marx's value theory of labor, many ideas, which modify, develop or negate the valuetheory, come into being. These people with ideas negating or modifying the value theory of labor have misunderstood the Marx's theory; because they haven't understood the essence of Marx's value theory of labor about labor, value, magnitude of valuedetermination and demand. There is no logical contradiction basically in Marx's value theory of 1abor. What's more, the theorycan explain the realities to some extend still has its real meaning.