The capitalist must then either enable the worker to complete the paid work time more quickly through relative means, or he must increase the work day in absolute terms. Without enabling unpaid work to exist, the capitalist system would not be able to sustain itself. With surplus labor resting on a natural basis, there are no natural obstacles preventing one man from imposing his labor burden on another. As a worker looks into the possible options of getting out of capitalist exploitation or the initial "animal condition", one of the obvious options is becoming a capitalist himself. This is called socialized labor which exists when the surplus labor of one worker becomes necessary for the existence of another. Marx mentions two natural conditions of wealth that are helpful in understanding the progression of socialized labor over time. The two conditions are natural wealth in the means of subsistence and natural wealth in the instruments of labor. Over time, society has moved more from the former to the latter. It was not that long ago that the majority of society produced for themselves and did not have to be concerned about producing surplus labor for others. We did labor for others, but it was not in effort to create surplus value; it was to help others. Marx uses the Egyptians as an example to illustrate a society's potential when there is extra time that does not have to be used toward creating surplus value. The Egyptians lived in a very fertile land (natural subsistence wealth) so they could raise children at a very low cost. This is the main reason why the population grew so large. One might think all the great Egyptian structures were possible because of the large population, but it is due to the availability of labor time. In regards to capitalism, you might think that a greater natural wealth of subsistence would result in greater growth and capitalist production (like the Egyptians), but that is not the case. So why is capitalism so strong in many countries that do not have excess natural resources? The answer is the necessity of bringing a natural force under the control of society (irrigation in Persia and India, flow of water in Egypt, etc.), As Marx says, "favourable conditions provide the possibility, not the reality of surplus labour". Marx displays an example of surplus labor occurring in these favorable conditions in the case of the East Indies. The inhabitants would be able to produce enough to satisfy all of his needs with only twelve working hours per week. This provides for more than enough leisure time until capitalist production takes hold. He may be required to work six days per week to satisfy his needs—there can be no explanation of why it is necessary for him to provide the extra five days of surplus labor.