NEW YORK (AP) — The central question gripping Wall Street this spring is whether the burst of inflation hitting the economy as it recovers from the pandemic is just temporary or the start of a real problem. The answer threatens to crack the stock market’s incredible, record-setting run that began in March 2020. No U.S. investor has had to contend with significant inflation for more than a generation. The last time inflation troubled the economy was in the 1970s and early 1980s, when it remained stubbornly above 10%.