Wall Street stocks rose on Tuesday, with the Dow Jones Industrial Average posting its fourth consecutive session of gains after Federal Reserve Chairman Jerome Powell expressed an optimistic US economic view and solid earnings bolstered the outlook for a robust reporting period.

In a written statement, Powell signalled that an era of stable economic growth may continue, but the Fed chairman was challenged in a congressional hearing by senators worried about the Trump administration's trade policies.

“(Powell) suggested that they're keeping an eye on trade developments and people are looking at that as a signal that they may moderate their rate increases if they see some signs of danger,” said Peter Jankovskis, co-chief investment officer at OakBrook Investments LLC in Lisle, Illinois.

The US Treasury yield curve hit its flattest in over a decade as Powell's upbeat economic view supported more rate hikes, with 2-year yields climbed to their highest in nearly a decade. As the second-quarter earnings season shifts into high gear this week, analyst forecasts have grown rosier.

Analysts now see second-quarter S&P 500 earnings growth of 21.2 per cent, up from 20.7 per cent on July 1. Of the 39 companies in the index that have reported so far, 84.6 per cent have come in ahead of Street expectations, according to Thomson Reuters data.

Earnings optimism was boosted by a report from the Federal Reserve showing an increase in US industrial production led by a rebound in manufacturing. “Economic reports ... are suggesting that activity in the second quarter might have been better than expected,” Jankovskis said. “That, perhaps, is playing into some of these increases in forecasts.”

The Dow Jones Industrial Average rose 55.53 points, or 0.22 per cent, to end at 25,119.89, the S&P 500 gained 11.12 points, or 0.40 per cent, to 2,809.55 and the Nasdaq Composite added 49.40 points, or 0.63 per cent, to 7,855.12.

The Nasdaq's advance was led by Facebook Inc, Google-parent Alphabet Inc and Amazon.com Inc , all of which hit record highs. Of the 11 major sectors of the S&P 500, seven ended the session in positive territory, with materials and technology seeing the strongest gains.

Johnson & Johnson led the healthcare sector's 0.5 per cent advance, rising 3.5 per cent after beating analysts' profit and revenue estimates. Shares of Goldman Sachs Group Inc edged down 0.2 per cent as the investment bank reported better-than-expected earnings and said David Solomon would replace outgoing CEO Lloyd Blankfein.

UnitedHealth Group Inc weighed the most heavily on the Dow, its shares down 2.6 per cent as the largest US health insurer reported higher-than-expected quarterly medical costs. Netflix Inc regained ground, rising 5.2 per cent after falling more than 14 per cent following the streaming services company's reported shortfall in second-quarter subscriber additions.

Advancing issues outnumbered declining ones on the NYSE by a 1.39-to-1 ratio; on Nasdaq, a 1.38-to-1 ratio favoured advancers. The S&P 500 posted 25 new 52-week highs and one new low; the Nasdaq Composite recorded 82 new highs and 52 new lows. Volume on US exchanges was 6.00 billion shares, compared to the 6.54 billion average over the last 20 trading days.

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