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“Since the values of the market were the highest criteria, persons also became valued as commodities which could be bought and sold. A person's worth is then his salable market value, whether it is skill or 'personality' that is up for sale. [...]
The market value, then, becomes the individual's valuation of himself, so that self-confidence and 'self-feeling' (ones experience of identity with one's self) are largely reflections of what others think of one, in this case the 'others' being those who represent the market. Thus contemporary economic processes have contributed not only to an alienation of man from man, but likewise to 'self-alienation' - an alienation of the individual from himself. As Fromm very well summarizes the point:

Since modern man experiences himself both as the seller and as the commodity to be sold on the market, his self-esteem depends on conditions beyond his control. If he is 'successful,' he is valuable; if he is not, he is worthless. The degree of insecurity which results from this orientation can hardly be overestimated. If one feels that one's own value is not constituted primarily by the human qualities one possesses, but by one's succes on a competitive market with ever-changing conditions, one's self-esteem is bound to be shaky and in constant need of confirmation by others. [Erich Fromm, Man for himself]

In such a situation one is driven to strive relentlessly for 'succes'; this is the chief way to validate ones self and to allay anxiety. And any failure in the competitive struggle is a threat to the quasi-esteem for one's self - which, quasi though it be, is all one has in such a situation. This obviously leads to powerful feelings of helplessness and inferiority.
[p.169f]”
― Rollo May, The Meaning of Anxiety