Comment by dragonwriter

> How are sec 175 changes in the US not also a top explanation?

You mean the change from deductible as a current expense to five-year amortization under changes to Sec 174? In an easy money situation, the way it increases tax liability in year one while decreasing in year 2-5 is not a big deal, it becomes more of an issue as the cost of financing goes up, so the main effect is to increase the already-high sensitivity of software development to tightening credit.