GOP debate: 5 of the night's biggest flubs

With eight candidates instead of 10, longer response and rebuttal time, and a focus on the details-heavy topic of taxes and the economy, the fourth GOP debate, which took place Tuesday night, was fertile ground for flubs, exaggerations, and outdated data.

Ben Carson misstated the rate of black youth unemployment, Carly Fiorina inflated the size of the Internal Revenue Service's tax code, and Donald Trump cited outdated data about President Eisenhower's Mexican immigrant deportation plan.

Here's five more whoppers from Tuesday night's debate.

"Welders make more money than philosophers. We need more welders and less philosophers." – Florida Sen. Marco Rubio

It's a great applause line, and it delivered – the crowd at the Milwaukee Theater ate it up.

But it's not true. Senator Rubio has dissed philosophy majors repeatedly on the stump, as a way to promote the value of vocational training. But according to PayScale.com, the mid-career average annual salary for graduates with a bachelor's degree in philosophy is $85,000. For graduates with an associates degree in welding technology, it's $58,500.

For college professors of philosophy, the highest-paid 10 percent enjoy salaries near $200,000. By contrast, the top 10 percent of welders make only about $58,590, according to data from the Bureau of Labor Statistics.

"Every time we raise the minimum wage, the number of jobless people increases." – Ben Carson

To defend his position of not raising the minimum wage, Mr. Carson recited this statement, which made up his main argument and a central Republican refrain: That raising the minimum wage would cost jobs.

But history shows otherwise. PolitiFact has compiled a chart showing the years when Congress raised the federal minimum wage and the months of job growth in the following one-year period. The findings: between 1978 and 2009, raising the minimum wage did not always result in job losses. In fact, according to its chart, the results were split almost evenly: Out of the 11 times the minimum wage was raised in that period, there was overall job growth six times and overall job loss five times.

What's more, it’s not clear that an increase in the minimum wage is the primary culprit for joblessness in the periods in which it rose, since those periods also coincided with broader economic recessions.

But Carson may have a point. The Congressional Budget Office has projected that raising the minimum wage from $7.25 to $10.10 per hour would result in 500,000 fewer workers having jobs, with up to 1 million possibly affected.

The Trans-Pacific Partnership signed by President Obama with 11 other nations "was designed for China to come in through the back door and take advantage of everyone.... China takes advantage (of the US) through currency manipulation." – Donald Trump 

"It is a deal that is going to lead to nothing but trouble," Trump continued.

The deal, which has yet to be approved by Congress, is a trade pact involving the US and 11 other countries. It has become a political flashpoint of sorts, with many Republicans, including Trump, criticizing it and Obama's negotiating skills. Trump used the occasion to bash the trade pact and China.

The only problem? China isn't actually part of the pact, as Sen. Rand Paul pointed out in one of the best moments of the debate.

It was perhaps the only flub caught in the moment during the debate – and not by the Fox Business Network moderators.

In fact, the TPP is intended to give the United States more influence in Asia as a counterweight to China's rising economic power.

Trump also said China is guilty of currency manipulation by keeping the value of its currency low to make its exports more competitive. That view is now outdated. China's currency, the yuan, has been rising in value for years and the International Monetary Fund says it's now fairly valued, according to NPR. 

"We have to recognize that small businesses right now, more of them are closing than are being set up." – Jeb Bush

It's a favorite theme among Republican candidates, painting a bleak picture of the US economy, complete with high unemployment, sluggish economic growth, and more.

And it's a claim that's been repeated before: "For the first time in 35 years, we have more businesses dying than starting," Sen. Rubio said in a previous debate.

In fact, that's true for the early years of the Obama administration, which coincided with the Great Recession. But it's not true now. In 2012 and 2013, more businesses opened their doors than closed them, according to the latest figures from the Census Bureau.

"We ought to look where income inequality seems to be the worst. It seems to be worst in cities run by Democrats." – Kentucky Sen. Rand Paul

In fact, Senator Paul's assertion is true. A Brookings Institution report ranked the top 10 and bottom 10 largest cities in the country by income inequality, using 2012 census data.

Of the 10 cities with the highest income inequality, nine had Democratic mayors, including Atlanta, San Francisco, Boston, Washington, and New York.

Of the 10 cities with the lowest income inequality, seven had Republican mayors, including Oklahoma City, Omaha, Fort Worth, Colorado Springs, and Mesa, Ariz.

But correlation isn't necessarily causation. The 10 cities with the most inequality also happen to be large cities, which are often led by Democrats. Larger cities tend to have more income inequality because they simply have more people – and people working in a variety of sectors.

In other words, the economic trends of a city or state aren't necessarily directly tied to the policy of its leader, or his or her party.