Despite the huge tax cut, he took in more tax revenue. Impressive.
Of course stimulus in boom times leads to greater government revenue, but let's not lose our heads. The net is still very negative. You may be experiencing the same euphoria one experiences when purchasing on "lay-a way." Deficits in boom times are fine so long as they are matched by increased investment. In the present case, the deficits are producing short term stimulus with insufficient long-term investment to counter the imbalance produced by leaving additional wealth in the economy at a rate greater than GDP Growth. This will lead to a correspondingly unpleasant corrective phase. But it is impossible to know when, at least not much in advance.
Let us not lose sight of at least four reasons for a broad measure of equities increasing at a rate greater than GDP growth: 1) stocks are observed to be going up in price on top of ubiquitous advice to buy. 2)increased aggregate, nominal earnings (inflation does not matter here, it is perception that counts); 3) increases due to stock buy-backs, sometimes using borrowed money which may produce only temporary increases in constant dollars depending on future inflation and other uncertain factors; 4) actual inflation due to money supply (credit) increasing faster than productivity. The last of these effects can be delayed by fed-treasury action, but not indefinitely.
To estimate where a broad index will return to in a calamitous collapse, i.e., one that succeeds in wresting most of the excesses out of the market, one can project the S&P forward from the most recent calamitous collapse, i.e., march 2009, at a rate approximating economic growth (~3% compounded). To the extent that future major corrections do not fully wring out excesses, and they hardly ever do, there is an inflation residual remaining in the broad equities market. Consumer price inflation is of course something that never gets wrung out other than in a deflation.
None of this is helpful to the day, or short term, trader, except perhaps in one way. The trader who understands that markets are driven by perception and nominal, rather than constant dollar, value, and that it is emotion rather than logic that leads us to buy stocks making a new peak, will not hesitate to buy an irrational market. They know such a market will very likely be even more irrational tomorrow. The best traders, however, understand that they are engaged in what is metaphorically a game of musical chairs, and they take pains to avoid being left without a chair when the music tops. To the person who trades longer term on macroeconomic developments and trends, these features I have outlined form a framework for their investing. They know, given a long enough horizon, markets will with certainty return to sanity, at least briefly. They are always guessing when.