This tweet by US president is extremely fascinating:
He says that he is tired of “trickle down economics” never working.
Trickle down economics is basically helping out large wealthy businesses with tax breaks , concessions and benefit them in the short run so that it helps the poor and rest of the society in the long run.
Whereas bottom up and middle out approach is basically about how poor and middle income to positively impact the society in the long run.
One wonders whether biden is saying this to appease his voters before elections or he is really serious about it …
Let us assume, he is serious (just an assumption!), The biggest implication naturally has to be the beginning of end of MMT.
What is MMT?
Modern Monetary Theory (MMT): Definition, History, and Principles.
MMT is a practice followed by many sovereign countries where they print money as much as they like and not worry about revenue (taxes etc) as they can print as much as want to pay off their expenditure.
US has now finally realised after accumulating debt above 30+ trillion dollar debt and having an interest outflow of 1.2 trillion dollars on a revenue of 3.5 trillion dollars (not including repayments)
Next few months (early 2023) is going to be 
to say the least