US-China trade war: tariffs kick in

US President Donald Trump’s controversial trade tariffs on Chinese goods have come into effect, signalling the start of a trade war between the two largest economies in the world.

The 25% levy, worth a total of $34bn (£25.7bn), kicked in at midnight Washington time. China has retaliated by imposing a similar 25% tariff on 545 US products, also worth a total of around $34bn.

China’s Ministry of Commerce said the US levies were “typical trade bullying”.

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“It seriously jeopardises the global industrial chain, hinders the pace of global economic recovery, triggers global market turmoil and will affect more innocent multinational companies, general companies and consumers,” the ministry continued in a statement on its website.

China’s state-run newspapers have also been highly critical of Trump, with the English-language China Daily accusing the White House of behaving like a “gang of hoodlums”.

The Beijing-based Global Times adds: “If what the US wants is to escalate a trade war with China then so be it. A little fighting may be the only way the Trump administration clears its mind and allows everyone to sober up.”

The president has said the tariffs are aimed at stopping the "unfair transfers of American technology and intellectual property to China" and protecting jobs, reports the BBC.

What is a tariff?

A tariff is a tax imposed on imported goods when they enter a country, either as a fixed additional cost per unit or as a percentage of their value.

Before the widespread introduction of income tax, tariffs were one of the main instruments available to governments to raise revenue.

However, “the main purpose of a tariff these days tends to be about protecting particular domestic industries from foreign competition”, says Amitrajeet A. Batabyal, an economics professor at the New York State-based Rochester Institute of Technology, in an article on The Conversation.

Depending on the economic clout of the countries involved and the size of the affected industries, tariffs can upend national economies and even affect global trade.

What are the pros and cons of tariffs?

Tariffs are a key tool of the economic policy known as protectionism, which seeks to protect national industries from overseas competition.

In theory, artificially inflating the cost of imported goods encourages businesses to buy domestic, preventing national industries from being undercut by cheaper foreign labour.

Left-wing advocates see protectionism as a means of protecting workers from a “race to the bottom” in which employers slash wages and benefits in order to compete with emerging economies.

However, while American steel and aluminium workers may welcome the new measures, consumers are likely to be less enthusiastic, as import-reliant businesses affected by the tariffs are likely to pass on increased production costs to customers.

The higher costs of production could also spell trouble for workers in businesses reliant on imported steel or aluminium.

“Studies found that the most recent steel tariff imposed by President George W. Bush in 2002 resulted in as many as 200,000 jobs lost in industries that use steel to make their products,” says Business Insider.

In addition, in a globalised marketplace, a move towards protectionism in a major economy such as the US risks causing severe disruption to world trade, as trading partners impose their own retaliatory tariffs.

The Confederation of British Industry’s international director, Ben Digby, has warned that such a trade war “will damage prosperity on both sides of the Atlantic”.