Infungible

Infungible property is that which cannot be easily or at all substituted and for which varying prices are paid in the market, e.g. manuscripts,

Source: wiktionary

Russian managers and entrepreneurs who seek to adapt to the new environment find themselves fettered by past infungible technological choices that neither adequately foresaw present contingencies, nor the long term needs of global competition.

Source: wiktionary

In other words, the human assets of workers are relatively infungible, in contrast to highly fungible segments of capital (Lane and Wood 2012).

Source: wiktionary