The word is officially out: Good is bad in the stock market once again (and, by extension, bad is good). When President Donald Trump finally weighed in Wednesday on the roller-coaster ride in equity markets, he went all the way back to the initial trigger from last week, lamenting how a strong U.S. jobs report sparked the first round of selling. \u201cIn the \u2018old days,\u2019 when good news was reported, the Stock Market would go up,\u201d Trump said on Twitter. \u201cToday, when good news is reported, the Stock Market goes down.\u201d All of which is sort of right. There are plenty of times in the past when good data was bad for the stock market - anyone who was around for the Greenspan Fed years, remembers that - but for the most part over the last decade, he\u2019s right, good was indeed generally good. In fact, of the 10 biggest positive surprises in that span on an index that measures how data stacks up against expectations, the S&P 500 rose seven times. So the reaction to the January jobs report - a 2.1 percent plunge in the S&P 500 Index on Friday alone - seemed to signal a break from that pattern. Why? Because unlike recent years, when the economic expansion was tepid and in its early stages, growth is running so hot now that investors fear that signs of even more strength will prompt the Federal Reserve to speed up the pace of interest-rate increases. And not only could higher rates cool the economy back down, but they make it more expensive to buy stocks on credit. Both of which are potentially bad for the market. As a result, experts say, good-is-bad is likely to be the new pattern for a while. \u201cThere\u2019s an element of truth in that yes, good news is prompting markets to reassess the loose monetary policy that has been in place the last 10 years,\u201d said Massud Ghaussy, director at Nasdaq Advisory Services. \u201cAs we\u2019re seeing inflation pick up, as we see wage growth, as we see GDP growth kicking in, the Federal Reserve has no other choice but to essentially raise interest rates and normalize - and that will in turn shock the equity markets.\u201d The turmoil that started Friday and contributed to biggest market rout in almost seven years on Monday is familiar to anyone who has lived through past episodes of Fed angst. It\u2019s a sort of paranoia that any sign of inflation that will encourage policy makers to raise rates. \u201cIt\u2019s the most common thing that can halt a bull market,\u201d said Donald Selkin, New York-based chief market strategist at Newbridge Securities Corp., which manages $2 billion. \u201cThe Fed sees economic activity picking up, and the demand for credit picks up, then they say \u2018oh, we have to raise rates to cool things off a little bit.\u2019 Chicago Fed President Charles Evans did just that Wednesday, sending the S&P 500 Index down from its session high after saying that if officials get \u201cmore confidence that inflation is moving up sustainably, then further rate increases would be warranted.\u201d The worry for equity investors is that higher interest rates bring higher Treasury yields, which could dampen the stock market\u2019s upward climb in a variety of ways. The 40-day correlation between the U.S. Citi Economic Surprise Index and the S&P 500 is at its lowest level since 2015. The gauge, which rises when economic data is better than expected, jumped nearly 10 percent Friday as equities tanked. \u201cOftentimes, the employment numbers or other meaningful economic statistics don\u2019t register very significantly in terms of market reaction and the market will tend to trade within the confines of directionally what it had been going into it,\u201d said Jim Grabovac, an investment strategist at McDonnell Investment Management. \u201cComing into last year, the markets underestimated what the Fed would ultimately do with three tightenings. We think coming into this year with this reaction thus far, the market is probably overestimating.\u201d And as traders assess what better-than-expected economic data means for the Fed\u2019s interest rate hike trajectory, they\u2019re also trying to figure out how much President Trump\u2019s tax overhaul will fuel growth. Analysts at Strategas Research Partners estimated the tax cut will add 0.2 to 0.3 percent boost to GDP this year, which is currently growing at a yearly rate of 2.5 percent. Now \u201cthe realization is kicking in that economic growth will be higher,\u201d the analysts led by Daniel Clifton, head of policy research, wrote in a note Monday. The Atlanta Fed increased their GDP growth forecast last week to 5.4 percent, the highest reading since 2012. Clifton notes that this number could change throughout the quarter, but a growth number of this caliber isn\u2019t too surprising when compared with historical reactions to fiscal policy. \u201cIn 2003, when the tax rates on income were dropped, real GDP was 7 percent at a time of consensus 2 percent growth,\u201d Clifton wrote. \u201cYields had to move higher to reprice this \u2018unexpected\u2019 growth.\u201d Still, some say good news can\u2019t stay bad news forever. According to Keith Parker, head of equity strategy at UBS Group AG, the S&P 500\u2019s pullbacks actually tend to be narrower when economic data beats forecasts. \u201cWhen economic data surprises have been positive, equity pullbacks have averaged 5 percent, suggesting last week\u2019s 4 percent selloff is close to an end,\u201d he wrote in a note to clients Monday.