So long as a mode of production still describes an ascending curve of development, it is enthusiastically welcomed even by those who come off worst from its corresponding mode of distribution. This was the case with the English workers in the beginnings of modern industry. And even while this mode of production remains normal for society, there is, in general, contentment with the distribution, and if objections to it begin to be raised, these come from within the ruling class itself and find no response whatever among the exploited masses. Only when the mode of production in question has already described a good part of its descending curve, when it has half outlived its day, when the conditions of its existence have to a large extent disappeared, and its successor is already knocking at the door — it is only at this stage that the constantly increasing inequality of distribution appears as unjust, it is only then that appeal is made from the facts which have had their day to so-called eternal justice.

Frederick Engels