Anthony Zurcher: Mr Biden took office as the US economy was beginning to emerge from a year of pandemic lockdowns. The good news for him was falling unemployment, a booming stock market and record-setting growth. The bad news is that the velocity of the rebound led to supply-chain struggles and inflation levels not seen in decades. If the economy can shake those negative aspects off, his record will look good - but the problems have not been as "transitory" as the administration promised.