求助英语翻译！对不起……没有财富值了，希望好心人帮忙

Question

Shoppers at retailer r who purchased substitute items from other manufacturers on day 1 paid a total amount that was approximately 10% of the total all day 1 shoppers would have paid had each of them been able to purchase product x on day 1.

这里面有一个“……would have paid had each of them been able to ……”这里面的had不是很理解，劳烦帮解释分析一下这句子……使用了倒装么？还是省略什么的

Answer 1

if非真实条件句的倒装：省略if，助动词提前。
had each of them been able to ... = if each of them had been able to...本回答被提问者采纳

Answer 2

消费者在购买商品的零售商替代其他制造商第一天支付总数额,约占总数的10%所有第一天购物者补偿给他们每个人都能购买产品在第一天。 had的意思是已经

Answer 3

消费者在购买替代商品零售商或其他厂商的1天支付的总金额，大约10%的所有1天的购物者会付出了他们每个人能够购买某产品的1天

你可以直接在百度里面在线翻译，我这个也是在里面翻译的！