hayan encarecido
Present perfect subjunctive ellos/ellas/ustedes conjugation of encarecer.

encarecer

Dada la subida significativa del precio del azúcar –el componente clave de la mayoría de las tartas–, no sorprende que todas las tartas se hayan encarecido.
Given that the price of sugar has increased significantly–and that this is the key component of most cakes–it is not surprising that all cake prices have increased.
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tinsel