wholesale为形容词：请看该词牛津8的解释：
wholesale
adjective [only before noun]
1. connected with goods that are bought and sold in large quantities, especially so they can be sold again to make a profit: wholesale goods / prices
Compare: RETAIL
2. (especially of sth bad) happening or done to a very large number of people or things: the wholesale slaughter of innocent people
wholesale adverb: We buy the building materials wholesale. ◆ These young people die wholesale from heroin overdoses.
第一个意思是：批发，retail意为“零售”
第二个意思是：大量的，大规模的（常作贬义）
本句中取第二个意思；
shift是名词，意为“转移”of后面的是定语，修饰shift, “。。。。。的转移”