Economists, like other scientists, have chosen the hypothesis from which they set out, and which they offer to beginners because it is the simplest, and not because it is the nearest to the facts. Partly for this reason, but partly, I admit, because they have been biased by the traditions of the subject, they have begun by assuming a state of affairs where the ideal distribution of productive resources can be brought about through individuals acting independently by the method of trial and error in such a way that those individuals who move in the right direction will destroy by competition those who move in the wrong direction. This implies that there must be no mercy or protection for those who embark their capital or their labour in the wrong direction. It is a method of bringing the most successful profit-makers to the top by a ruthless struggle for survival, which selects the most efficient by the bankruptcy of the less efficient. It does not count the cost of the struggle, but looks only to the benefits of the final result which are assumed to be permanent. The object of life being to crop the leaves off the branches up to the greatest possible height, the likeliest way of achieving this end is to leave the giraffes with the longest necks to starve out those whose necks are shorter.
If we have the welfare of the giraffes at heart, we must not overlook the sufferings of the shorter necks who are starved out, or the sweet leaves which fall to the ground and are trampled underfoot in the struggle, or the overfeeding of the long-necked ones, or the evil look of anxiety or struggling greediness which overcasts the mild faces of the herd.
John Maynard Keyes, “The End of Laissez-Faire” (1926)
An excellent short essay worth reading in its entirety.