According to Marx's theory, surplus value is equal to the new value created by workers in excess of their own labor-cost, which is appropriated by the capitalist as profit when products are sold. (Wikipedia)
JG: Capitalist millionaires & billionaires do not create wealth, because they, basically, live as parasites. Only the working class creates surplus value, with their labor.
Arriba los pobres del mundo,
De pie los esclavos sin pan,
Gritemos todos unidos,
VIVA LA INTERNACIONAL.