hayan abaratado
Present perfect subjunctiveellos/ellas/ustedesconjugation ofabaratar.

abaratar

Se trata, no obstante, de un recurso muy caro, a pesar de que los costes del procedimiento se hayan abaratado notablemente en los últimos años.
Although the costs for this procedure have sunk considerably in the last few years, in view of the amount of material it is still not within our reach.
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