Can you please explain "propping upward" and "zeroed out" here?

But if you have good things to do with it - whether it's public investment, whether it's propping upward in a recession, which I'd to zeroed out... you should do it the benefits are likely to largely increase...

In case that I've got the expression wrong.. I add the video

(Starting 0:55)

OQl9vHLr2eQ

He has a moderately strong French accent that makes him unsuitable for what you are trying to do. Also, the audio is terrible, and he he suffers from genius mouth, where he slurs the most important words because he expects you to already know what he is going to say. I can barely understand him, and I speak French some.