Spending government money on road construction does nothing to lower local unemployment, a massive new study of 700 counties by the AP shows.

There is no difference in unemployment trends between counties that received the most stimulus money and the group that received none.

The myth of the government spending money on road construction to fight unemployment seems to be based on inaccurate memories of the public works projects of the Great Depression rather than fact. Marshall country in Tennessee received more road money than almost any other county in America. Unemployment there is heading toward 20%.

"As a policy tool for creating jobs, this doesn't seem to have much bite," said Emory University economist Thomas Smith, who supported the stimulus and reviewed AP's analysis.

So why is the government spending so much money creating jobs? The government has already spent over $20 billion for road construction and is now considering a $75 billion second stimulus bill. Much of that would likely be spent on construction projects.

The simplest answer for this myth is that the private construction companies that build roads are excellent lobbyists and the efforts to increase government spending on these projects have huge payoffs. In most areas, there are few companies that can bid on the projects. Few bidders means that each construction company stands a decent chance of receiving a government payoff.

Here's the full write-up of the study from the AP:

Ten months into President Barack Obama's first economic stimulus plan, a surge in spending on roads and bridges has had no effect on local unemployment and only barely helped the beleaguered construction industry, an Associated Press analysis has found.

Spend a lot or spend nothing at all, it didn't matter, the AP analysis showed: Local unemployment rates rose and fell regardless of how much stimulus money Washington poured out for transportation, raising questions about Obama's argument that more road money would address an "urgent need to accelerate job growth."

Obama wants a second stimulus bill from Congress that relies in part on more road and bridge spending, projects the president said are "at the heart of our effort to accelerate job growth."

Construction spending would be a key part of the Jobs for Main Street Act, a $75 billion second stimulus to revive the nation's lethargic unemployment rate and improve the dismal job market for construction workers. The House approved the bill 217-212 last month after House Speaker Nancy Pelosi, D-Calif., worked the floor for an hour; the Senate is expected to consider it later in January.

AP's analysis, which was reviewed by independent economists at five universities, showed that strategy hasn't affected unemployment rates so far. And there's concern it won't work the second time. For its analysis, the AP examined the effects of road and bridge spending in communities on local unemployment; it did not try to measure results of the broader aid that also was in the first stimulus like tax cuts, unemployment benefits or money for states.

"My bottom line is, I'd be skeptical about putting too much more money into a second stimulus until we've seen broader effects from the first stimulus," said Aaron Jackson, a Bentley University economist who reviewed AP's analysis.

Even within the construction industry, which stood to benefit most from transportation money, the AP's analysis found there was nearly no connection between stimulus money and the number of construction workers hired or fired since Congress passed the recovery program. The effect was so small, one economist compared it to trying to move the Empire State Building by pushing against it.

"As a policy tool for creating jobs, this doesn't seem to have much bite," said Emory University economist Thomas Smith, who supported the stimulus and reviewed AP's analysis. "In terms of creating jobs, it doesn't seem like it's created very many. It may well be employing lots of people but those two things are very different."

Transportation spending is too small of a pebble to quickly create waves in the nation's $14 trillion economy. And starting a road project, even one considered "shovel ready," can take many months, meaning any modest effects of a second burst of transportation spending are unlikely to be felt for some time.

"It would be unlikely that even $20 billion spent all at once would be enough to move the needle of the huge decline we've seen, even in construction, much less the economy. The job destruction is way too big," said Kenneth D. Simonson, chief economist for the Associated General Contractors of America.

Few counties, for example, received more road money per capita than Marshall County, Tenn., about 90 minutes south of Nashville.

Obama's stimulus is paying the salaries of dozens of workers, but local officials said the unemployment rate continues to rise and is expected to top 20 percent soon. The new money for road projects isn't enough to offset the thousands of local jobs lost from the closing of manufacturing plants and automotive parts suppliers.

"The stimulus has not benefited the working-class people of Marshall County at all," said Isaac Zimmerle, a local contractor who has seen his construction business slowly dry up since 2008. That year, he built 30 homes. But prospects this year look grim.

Construction contractors like Zimmerle would seem to be in line to benefit from the stimulus spending. But money for road construction offers little relief to most contractors who don't work on transportation projects, a niche that requires expensive, heavy equipment that most residential and commercial builders don't own. Residential and commercial building make up the bulk of the nation's construction industry.

"The problem we're seeing is, unfortunately, when they put those projects out to bid, there are only a handful of companies able to compete for it," Zimmerle said.

The Obama administration has argued that it's unfair to count construction jobs in any one county because workers travel between counties for jobs. So, the AP looked at a much larger universe: The more than 700 counties that got the most stimulus money per capita for road construction, and the more than 700 counties that received no money at all.

For its analysis, the AP reviewed Transportation Department data on more than $21 billion in stimulus projects in every state and Washington, D.C., and the Labor Department's monthly unemployment data. Working with economists and statisticians, the AP performed statistical tests to gauge the effect of transportation spending on employment activity.

There was no difference in unemployment trends between the group of counties that received the most stimulus money and the group that received none, the analysis found.

Despite the disconnect, Congress is moving quickly to give Obama the road money he requested. The Senate will soon consider a proposal that would direct nearly $28 billion more on roads and bridges, programs that are popular with politicians, lobbyists and voters. The overall price tag on the bill, which also would pay for water projects, school repairs and jobs for teachers, firefighters and police officers, would be $75 billion.

"We have a ton of need for repairing our national infrastructure and a ton of unemployed workers to do it. Marrying those two concepts strikes me as good stimulus and good policy," White House economic adviser Jared Bernstein said. "When you invest in this kind of infrastructure, you're creating good jobs for people who need them."

Highway projects have been the public face of the president's recovery efforts, providing the backdrop for news conferences with workers who owe their paychecks to the stimulus. But those anecdotes have not added up to a national trend and have not markedly improved the country's broad employment picture.

The stimulus has produced jobs. A growing body of economic evidence suggests that government programs, including Obama's $700 billion bank bailout program and his $787 billion stimulus, have helped ease the recession. A Rutgers University study on Friday, for instance, found that all stimulus efforts have slowed the rise in unemployment in many states.

But the 400-page stimulus law contains so many provisions — tax cuts, unemployment benefits, food stamps, state aid, military spending — economists agree that it's nearly impossible to determine what worked best and replicate it. It's also impossible to quantify exactly what effect the stimulus has had on job creation, although Obama points to estimates that credit the recovery program for creating or saving 1.6 million jobs.

Politically, singling out transportation for another round of spending is an easier sell than many of the other programs in the stimulus. The money can be spent quickly and provides a tangible payoff. Even some Republicans who have criticized the stimulus have said they want more transportation spending.

Spending money on roads also ripples through the economy better than other spending because it improves the nation's infrastructure, said Bernstein, the White House economist.

But that's a policy argument, not a stimulus argument, said Daniel Seiver, an economist at San Diego State University who reviewed AP's analysis.

"Infrastructure spending does have a long-term payoff, but in terms of an immediate impact on construction jobs it doesn't seem to be showing up," Seiver said. "A program like this may be justified but it's not going to have an immediate effect of putting people back to work."