A new quarterly measure of Los Angeles County consumers’ confidence in the economy showed a sharp dip in the fourth quarter, which included the presidential election.

The inaugural index from the Lowe Institute of Political Economy and Claremont McKenna College stood at 106.3 in the quarter, down 12% from 120.8 in the third quarter last year and down 7% from 114.2 in the fourth quarter of 2015. The institute began gathering data more than a year ago to establish a baseline.

The drop “may have been driven by the unexpected election of Donald Trump as president,” the institute said, noting that the “majority of Los Angeles County is deeply Democratic with policy views that are opposite those of the new administration.”

The index is intended to help provide guidance about future consumer spending in the Los Angeles area, and the fourth-quarter drop “is a cautionary note,” said Marc Weidenmier, the institute’s director.

“Is it a knee-jerk reaction” to the election “or is this a pattern that persists?” Weidenmier said. “We’ll have more information in the first quarter [this year].”

The institute developed the index because, while national consumer sentiment is measured by the Conference Board business group, the University of Michigan and others, the outlook of consumers in specific metro areas such as Los Angeles had been absent, Weidenmier said.

The national indexes have trended higher in recent months. The Conference Board, for instance, said its index climbed 4% in December from the prior month.

In the Lowe Institute index, 500 randomly sampled people in Los Angeles County were asked seven questions, including whether they believed business conditions would improve in the next year and whether they expected to be better off financially in the next 12 months.

Consumer confidence among the respondents aged 44 and under, and those between 55 and 64, showed sharp declines in the fourth quarter, while those aged 45 to 54 and 65-plus showed an upswing in consumer optimism, the institute said.

The institute also has started gathering consumer-confidence data in Orange County and hopes to announce the start of an index for that county later this year, Weidenmier said.

The Patriots stun the Falcons with a history-making comeback, beating Atlanta in the game's first-ever overtime, Californians are paying billions for power they don't need. Despite Trump's orders, it's business at usual at the U.S. border. Following Trump's executive order to fast-track two pipelines, thousands converged in downtown L.A. on Sunday to protest.

The Patriots stun the Falcons with a history-making comeback, beating Atlanta in the game's first-ever overtime, Californians are paying billions for power they don't need. Despite Trump's orders, it's business at usual at the U.S. border. Following Trump's executive order to fast-track two pipelines, thousands converged in downtown L.A. on Sunday to protest.

The Patriots stun the Falcons with a history-making comeback, beating Atlanta in the game's first-ever overtime, Californians are paying billions for power they don't need. Despite Trump's orders, it's business at usual at the U.S. border. Following Trump's executive order to fast-track two pipelines, thousands converged in downtown L.A. on Sunday to protest.

The Patriots stun the Falcons with a history-making comeback, beating Atlanta in the game's first-ever overtime, Californians are paying billions for power they don't need. Despite Trump's orders, it's business at usual at the U.S. border. Following Trump's executive order to fast-track two pipelines, thousands converged in downtown L.A. on Sunday to protest.

Jarin Islam of the Wilshire Center-Koreatown Neighborhood Council joins other community advocates and leaders for a news conference and solidarity rally with the Muslim community of Los Angeles.

Jarin Islam of the Wilshire Center-Koreatown Neighborhood Council joins other community advocates and leaders for a news conference and solidarity rally with the Muslim community of Los Angeles.

3-year-old filly is impressive

3-year-old filly is impressive

Thousands of people gathered Sunday in downtown Los Angeles to protest the proposed $3.8-billion Dakota Access pipeline, which activists across the country say threatens the water supply and sacred sites of the Standing Rock Sioux Tribe in North Dakota.

Thousands of people gathered Sunday in downtown Los Angeles to protest the proposed $3.8-billion Dakota Access pipeline, which activists across the country say threatens the water supply and sacred sites of the Standing Rock Sioux Tribe in North Dakota.

Opponents of President Trump's executive order on refugees and immigration began rallying in front of Tom Bradley International Terminal around 11 a.m. They were joined about an hour later by a smaller group of travel ban supporters who stationed themselves across the roadway.

Opponents of President Trump's executive order on refugees and immigration began rallying in front of Tom Bradley International Terminal around 11 a.m. They were joined about an hour later by a smaller group of travel ban supporters who stationed themselves across the roadway.

james.peltz@latimes.com

Twitter: @PeltzLATimes

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