[求助]句子结构分析

susu1230

But that prediction would not have adversely affected the dollar had it not been for the government’s huge budget deficit, which must therefor be decreased to prevent future currency declines.
这是OG上的一个句子，请帮我分析一下画线部分的句子成份。It 指代的是哪个，为什么倒装。

sbbi

it应该指prediction吧