Donald Trump. Mike Segar/Reuters On Thursday, CNN reported that President-elect Donald Trump's administration is considering imposing a 5% tariff on all imports into the United States.

While the decision is not final, sources told CNN the tariff could be implemented through an executive order in the early days of the Trump presidency.

The move is not surprising, given that Trump made free trade one of the central topics of his campaign after criticizing China, Mexico, and Japan.

He suggested putting a 45% tariff on Chinese imports, said he would declare China a currency manipulator on his first day in office, proposed taxing imports from Mexico, said he'd "rip up" trade deals, and called the Trans-Pacific Partnership, or TPP, "a rape of our country."

Trump has said in victory rallies since the election that for trade, "we have to look at it almost as a war," asking "who the hell cares if there's a trade war?"

Trump said China specifically is committing "the greatest jobs theft in the history of the world."

Willem Buiter, chief economist at Citi, wrote in a note to clients before the report of the new tariff that protectionist trade policies might spark a global trade war, "which could easily trigger a global recession."

Deutsche Bank has also addressed the negative risks of the Trump trade agenda. A team from the firm wrote in a note on Friday that "the biggest threat to growth is a possible protectionist turn, which could depress global trade and even trigger trade wars."

In addition to the tariff talk, Trump appointed Peter Navarro head of the new National Trade Council on Wednesday. Navarro has been a longtime critic of China — he wrote a book titled "Death By China."

While these moves do not signal a coming collapse in international trade, they suggest that Trump's more protectionist tendencies will come out during his time in office.

Additionally, a tariff of any kind is likely to spark a reaction from major US trading partners such as China. Chinese officials are reportedly weighing options for how to respond to hostile trade moves by Trump.

Given the moves by Trump, we've broken down just how a protectionist trade scenario could affect the US economy and the geopolitical order.

A macroeconomic drag

A 5% tariff may affect the US economy — higher costs, a slight drag to GDP growth — but economists are worried about what it signals going forward.

Michael Gapen, a chief US economist at Barclays, has estimated the economic drag that tariffs on imports from China and Mexico may have on US GDP growth.

Assuming a 15% tariff on Chinese imports and a 7% tariff on Mexican imports — modestly above their current levels of 2-10%, depending on the good — Gapen estimated that the US would see a 0.5% reduction in annual GDP growth in just the next year.

Workers process laptop accessories at a factory in China. Stringer/Reuters

Meanwhile, Buiter said Citi estimates trade and other policy uncertainties could be a 1% drag on US GDP over the next year.

And should the president-elect eventually follow through with any of these policies, the US risks retaliatory measures from other countries.

"If tariffs are more punitive and lead to a public trade spat with China, markets will get nervous, especially if a sharp, retaliatory, [Chinese yuan] depreciation looks like a realistic response," said Ajay Rajadhyaksha, head of macro research at Barclays.

If other countries follow this pattern, it could lead to a downward spiral or litigation at the World Trade Organization.

"Depending on the specific measures, retaliatory action from elsewhere could be expected, while the risk of trade and currency wars could grow," said Janet Henry, chief global economist at HSBC.

Making it more expensive for consumers

An increase in tariffs could be passed through to individual Americans by companies in the form of higher prices.

Parts for consumer items are made abroad, so increasing tariffs could make it more expensive to import these parts for goods. To protect corporate profits and margins, companies could hike prices — which is not ideal for consumers.

A crucial thing to consider here is that this type of price increase is not caused by the virtuous wage and price increase cycle, but rather by an exogenous shock to prices without a boost to the labor market. In plain English, that means that while parts manufactured in China instantly become more expensive for Americans under tariffs, wages do not necessarily go up the corresponding amount to offset this cost increase.

Theoretically, companies could avoid tariffs by increasing production in the US. However, the problem is that labor is more expensive in America, so even if companies brought production to the US, the increased labor costs could push prices up, too.

A 'nail in the coffin' of the post-World War II economic order

Not only could Trump's moves affect everyday consumers in the US, they also could upend macroeconomic policies that have been in place for more than half a century. As Buiter notes, these policies have increased worldwide prosperity and been positive developments for the US.

From the Citi economist's note (emphasis added):

"We stress the potential multipliers of changes in the US position on international trade: the US has been the champion of free trade and open borders for decades. A retreat from globalization by the US would likely lead to reciprocal actions from other countries, and reinforce the latest shift towards de- globalization and could be another nail in the coffin of the liberal global economic world order that has supported prosperity since 1948."

Taking it a step further, now that Trump has been elected president, the possibility of passing the TPP — the landmark free trade agreement that aims to slash tariffs and promote economic growth among 12 nations in the Pacific Rim excluding China — has effectively dropped to nil.

(President Barack Obama's administration has already suspended its efforts to win congressional approval for the deal before Trump takes office, saying that its fate is up to the president-elect and Republican lawmakers.)

Japanese Prime Minister Shinzo Abe and Chinese President Xi Jinping. REUTERS/Kim Kyung-Hoon

And that could have major implications for the future of the economic and geopolitical order in Asia Pacific, given that the deal is arguably more about the US's long-term position in Asia than about the near-term financial advantages.

Americans want jobs

Mainstream economists generally agree that free trade is good for an economy in the long run — even though within an economy there will be some people who benefit less, particularly in the short term — while trade-restrictive measures hurt consumers.

However, some voters across developed economies believe free trade hurts their countries, which is likely a reflection of their personal experiences.

In the US, 89% of Americans said they think the loss of US jobs to China is a somewhat or very serious issue, according to Pew Research statistics previously cited by Bank of America Merrill Lynch's Ethan Harris and Lisa Berlin.

Moreover, only 46% of Americans said they think NAFTA was good for the economy. But it's not just Americans dreaming of a manufacturing comeback — Japanese farmers, for example, have been staunchly against the TPP.

There's some empirical evidence to back up those grievances. In January, labor economists David Autor, David Dorn, and Gordon Hanson published a paper showing that increased trade with China caused some big problems for US workers.

From the paper's meaty abstract (emphasis ours):

"China's emergence as a great economic power has induced an epochal shift in patterns of world trade. Simultaneously, it has challenged much of the received empirical wisdom about how labor markets adjust to trade shocks. Alongside the heralded consumer benefits of expanded trade are substantial adjustment costs and distributional consequences. ...

"Adjustment in local labor markets is remarkably slow, with wages and labor-force participation rates remaining depressed and unemployment rates remaining elevated for at least a full decade after the China trade shock commences.

"Exposed workers experience greater job churning and reduced lifetime income. At the national level, employment has fallen in US industries more exposed to import competition, as expected, but offsetting employment gains in other industries have yet to materialize."

Moreover, most of the economic gains from globalization have been for the middle class in emerging markets — not the middle class in developed markets such as the US.

Below is one of the more popular charts illustrating this, from the economist Branko Milanovic, via BAML's Ajay Singh Kapur and Ritesh Samadhiya in June.

BAML

Although both Trump and Hillary Clinton zeroed in during their campaigns on workers' anxieties over job losses, it's important to note that at least some of America's job losses are not due to trade, but rather due to automation. And crucially, automation not only hits manufacturing, but also affects jobs that require advanced degrees, such as neuroradiology.

"From a political perspective, I don't think the focus on trade is misplaced. It's effective because it has an 'other,'" Alexander Kazan, a strategist at Eurasia Group, said in a video for the Eurasia Group Foundation. "When you talk about technology, it's much more amorphous. It's this sense that we all lose. So I think politically it's less effective."

Depends on how much is done

Ultimately, a lot will depend on how much protectionist policy Trump is able to pass when he steps into the Oval Office.

Donald Trump and Speaker of the House Paul Ryan. Thomson Reuters

Some observers say it's unclear how much anti-trade rhetoric Trump genuinely intends to carry out. Additionally, there is a strong contingent within Trump's own party that is supportive of free trade.

The possible tariff and the appointment of Navarro, however, are signs that protectionist trade could play a major factor in the Trump policy agenda.