Reibun
。

The cause is the drop in rice prices, which is attributed to consumers moving away from rice and international market liberalization.

Literal

Consumers [possessive-の] rice-distancing [and-や] international market liberalization [subject-が] cause [quotative-とされる] rice-price [possessive-の] decline [subject-が] cause [copula-だ].

米離れ 'moving away from rice' — 離れ 'distancing' suffix. 国際市場解放 'international market liberalization.' 米価 'rice price.' とされる 'is said to be, is attributed to' — passive of とする. The sentence structure doubles 原因: the drop in rice prices is the cause, and that drop itself has causes. Dense agricultural policy language.