I think this is the more interesting question than the other thread since the savings will have to be made over time. The biggest change is that the US will not be the giant market for consumer/retail goods and services it once was since everyone will focus on savings, and buying needs vs wants.
The US economy will turn of one into a net lender rather than net consumer, but this assumes that the vacuum will be filled as the US turns away from spending. Also, we have to determine if the government will also be saving rather than spending. The US is number 2 in terms of per capita spending (UAE and all their oil and luxury leisure activities are #1). Hong Kong is number 3, the rest in order are: Swiss, Lux, Bermuda, Norway, Macau, Germany, Canada, Austria, Australia. Then you have to look at percent of world market (this is all off the top of my head from my barely used econ degree): the US is 27% of the world’s market (non-exceptional, ha!) which represents $11.5 Trillion in household final consumption expenditure dollars. To equal this offset, you have to look at the next 6 countries: China is 2nd at 7.72% (3.32 T in HFCE), Japan, German, UK, France, and Brazil (3.26%, 1.40 T HFCE).
Looking at the list of per capita spending and spending by market and corresponding HFCE, there is little congruity, with only the US and Germany being on both (Canada and Australia make the top 15 in the second list). The reason for comparison is to see if there are any indicative habits between the populaces. A lot more number crunching and assumptive ratios will have to be scrutinized to provide more than a back of the envelope analysis. For instance, UAE which is number 1 in per capita spending is #33 as percent of the global market, meaning for a people that spend a bunch, it’s not a large part of the overall market so their consumer decisions would have less impact.
My hypothesis is that with such a large drop in global demand, prices will have to drop immensely, but over time. There may be some shocks as people/investors get ahead of the curve, but nothing as if this were to happen all of a sudden. Any industry with a high labor component, with commodity inputs, and commodity like substitutes, is going to send production to lower labor cost production geographies (assuming free markets).
I would also predict interest rates to drop since a large amount of people are now turning away from spending to saving cash. Banks will have to drop interest rates to loan out their increasing cash deposits. Wealthier investors will probably invest heavily in equity positions, possibly more capital available in terms of angel investments, and startups, my bet will investment dollars will seek cash rich investments.
I don’t predict good times for low margin business. The mega corps will still exist, just at lower profit levels. Smaller business and industries will shrink or go out of existence (why work when you can save?)
Lastly, I think there will be less innovation. Without the demand, innovation will start to be phased out for higher profits. There will be less need to distinguish oneself from competitors, again, assuming savings mentality is paramount. For example, flip phones may still be in vogue, how many 9 - 17 year olds really need the internet mobile with them? That being said, anything that makes the home more efficient/entertaining will probably be good business.