What is the legitimate Islamic solution for the repercussions of taking goods and paying for them later, then being unable to settle the amount after the goods’ value has decreased, given straitened circumstances and inability to compensate for the loss?

A sale, once it fulfills its conditions and pillars, becomes effective, and its legal consequences follow, such as the buyer owning the commodity and the seller owning the price. If the buyer is unable to pay the price and wishes to return the goods, the matter depends on the seller's approval of the rescission (iqalah), for which he will be rewarded. Rescission means that the buyer regrets his purchase and returns the commodity to the seller, who accepts it. Rescission is valid whether the goods are intact or if something has been diminished from them. If something has been diminished, then rescission is valid for what remains of the goods, proportionate to its share of the price. This applies if rescission is considered a cancellation. However, if it is considered a sale, then it is permissible to agree to sell the goods back to the original seller at any price agreed upon by both parties, whether immediate or deferred.