Well, it's a good thing you know it's under valued. Better get those appraisers informed pronto.
Yes, because the modern intuitive linear forecasting is based on linear models, the market is undervalued by about a third...an exponential model would conservatively increase the market value by 3 times..from roughly $40 trillion to $120 trillion. Eventually this model will have to replace the current outdated one.
As for the some of the other economic issues: