English to Spanish Bus/Financial Business/Commerce (general)

Many knowledge-intensive business services products can be considered as **credence goods**, in other words, before and perhaps even shortly after purchasing the service, the client firm may be unable to judge its quality adequately.

Podrían ser "productos de crédito", pero no sé si habría alguna forma que no llevara a error. Productos creibles? De credibilidad?

Cualquier idea será bienvenida.
Gracias!!!!!!!
*:-)