…the population during the Mughal period did not remain stable though the compound rate of growth, 0.14% per annum, was hardly spectacular and was mu… - Irfan Habib

In one of his theses Marx said: 'Philosophers have so far interpreted the world. The point is to change it.' Marxism sees an innate unity between perception of the past and present practice. This unity implies continuous interaction: as time passes and history (human experience) lengthens, we draw greater lessons from it for the present; and as our present experience tells us more about the possibilities and limitations of social action, we turn to the past and obtain new comprehensions of it.

The pressure of new circumstances led initially to large-scale slave-trading and the emergence of slave labour during the thirteenth and fourteenth centuries. The numbers of slaves in the Sultans' establishments were very high (50,000 under Alauddin Khilji, and 180,000 under Firuz Tughluq). Barani judges the level of prices by referring to slave prices, and the presence of slaves was almost all-pervasive.

Without undue modesty, we can say we know more about India’s past than Marx did.