The major domestic equity indexes began the fourth quarter on a strong note on Monday, with all three major indexes hitting record high closes as data pointed to underlying strength in the economy.

Manufacturing activity hit a 13-1/2-year high in September. Disruptions to the supply chains caused by Hurricanes Harvey and Irma resulted in factories taking longer to deliver goods and boosted raw material prices.

Among the sectors with the largest gains on Monday were materials, industrials and financials.

Optimism about tax reform also continued to bolster stocks. So it was no surprise that the small-cap Russell 2000 posted another record high close. Small-cap companies are expected to be among the biggest beneficiaries of a tax cut.

Details were still emerging on the deadliest mass shooting in our history. A gunman killed at least 58 people and wounded more than 500 more in Las Vegas on Sunday. Shares of gun makers rose, including Sturm Ruger, up 3.5 percent.

General Motors chalked up a gain of 4.4 percent reaching an intraday record high after brokerage Deutsche Bank said the company could launch driverless cars on a large scale in 2020.

Approximately 6.3 billion shares changed hands on the major domestic equity exchanges, about even with the daily average for the past 20 trading days, according to Thomson Reuters data.

Manufacturing Rises Due to Hurricanes

Manufacturing activity hit a 13-1/2-year high in September as disruptions to the supply chains caused by Hurricanes Harvey and Irma resulted in factories taking longer to deliver goods and boosted raw material prices.

Still, details of the Institute for Supply Management’s (ISM) survey on Monday underscored the economy’s underlying momentum, with factories reporting stronger order growth last month. A measure of factory employment hit its highest level since 2011.

ISM said its index of national factory activity surged to a reading of 60.8 last month, the highest reading since May 2004, from 58.8 in August. A reading above 50 in the ISM index indicates an expansion in manufacturing, which accounts for about 12 percent of the economy.

The ISM said Harvey and Irma had caused supply chain and pricing issues in the chemical products sector. There were also concerns about the disruptive impact of the storms on the food, beverage and tobacco products industries.

Manufacturers of nonmetallic mineral products said while the storms were boosting sales, they were also causing significant price increases on input raw materials.

As a result, the ISM’s supplier deliveries sub-index soared 7.3 points to 64.4 last month. A lengthening in suppliers’ delivery time is normally associated with increased activity, which is a positive contribution to the ISM index.

The survey’s prices paid sub-index rose 9.5 points to 71.5, the highest reading since May 2011.

Discounting the hurricanes’ impact, the outlook for manufacturing remains bullish. Seventeen out of the 18 manufacturing industries reported growth last month.

The ISM survey’s production sub-index rose 1.2 points to a reading of 62.2 in September and a gauge of new orders jumped to 64.6 in September from 60.3 in August.

Factories also reported that customers’ inventories remained at levels considered “too low” last month. The ISM said this was an indication that “downstream customers continue to operate at a high level of demand that production cannot fully satisfy.”

The ISM said its measure of factory employment increased 0.4 point to 60.3, the highest since June 2011.

Harvey and Irma are expected to result in a reduction of as much as six-tenths of a percentage point in the nation’s gross domestic product growth in the third quarter. Harvey has undercut consumer spending and weighed on industrial production, homebuilding and home sales.

Further weakness is likely after Irma struck Florida in early September, causing widespread power cuts. The economy grew at a 3.1 percent annualized rate in the second quarter.

In separate report on Monday, the Commerce Department said construction spending rose 0.5 percent as outlays for both private and public projects increased, ending two straight monthly declines. Construction spending advanced 2.5 percent on a year-on-year basis.

The government said Harvey and Irma did not appear to have impacted the construction spending data as the responses from the Texas and Florida areas affected by the storms were “not significantly lower than normal.”

September data could, however, be impacted. According to the Commerce Department, Texas and Florida accounted for 22 percent of U.S. private nonresidential construction spending in 2016. They made up 15 percent of U.S. state-and-locally owned construction spending in 2016.