The United States and China have exchanged accusations of dumping for years and imposed tit-for-tat duties.
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The speculation on the street is that it was a tit-for-tat assassination between rival gangs.
In the 1930s, the Smoot-Hawley tariff provoked tit-for-tat responses and a collapse of world trade.
Courts in 10 countries have been asked to adjudicate an apparently tit-for-tat series of intellectual property claims.
There is a regular tit-for-tat exchange between the governments of Peru and Bolivia based on their political differences.
"For the first time, we are getting into a tit-for-tat syndrome, " he said.
The two companies continue to play tit-for-tat with their patents around the world.
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By describing the coalition agreement as a purely contractual affair, Mr Clegg inaugurated a new era of tit-for-tat politicking.
Tehran said Wednesday it was temporarily recalling its ambassador from London, another move in escalating tit-for-tat gestures between the governments.
Adarsh Sinha of Barclays Capital thinks the Swiss move will not be the start of a tit-for-tat round of devaluations.
One social media expert told the BBC that the tit-for-tat action had been motivated by Instagram's desire to make money.
Meanwhile, Iranian Foreign minister Manouchehr Mottaki confirmed Tehran was looking at relations with the UK following the tit-for-tat diplomatic expulsions.
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Fears that the Japanese might resort to a tit-for-tat devaluation of the yen to boost exports have contributed to currency devaluations elsewhere.
Even worse would be an associated tit-for-tat trade battle between the rich.
Your report states that there was tit-for-tat violence, but the reality is that it was fairly quiet in the city at the time.
It was the latest in a string of tit-for-tat murders over the past few months that have placed strain on a ceasefire deal signed in 2002.
But the first country to send a missile, even a non-nuclear one, could trigger a tit-for-tat set of reprisals that both sides could find hard to stop.
The tit-for-tat claim asserts that the Agent said she could impose no penalty or a 40% penalty depending on whether the taxpayer gave her what she wanted.
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Both India and Pakistan are proven nuclear powers after last year's tit-for-tat tests, and it is believed they may each possess a small number of nuclear warheads.
But this time around, economists say the tit-for-tat between the leading candidates is little more than election campaigning and masks the fact that they have made similar commitments.
The trial heard that Mr Greene's killing was a result of a spiralling tit-for-tat war between two groups of young men from a small area of north-west London.
DSU's recommended penalties are structured, tit-for-tat is a likely outcome.
Not only did that avert a round of tit-for-tat devaluations.
But Pakistan's refusal to play appears to be a tit-for-tat response after India said they would not take part in a Test and one-day series in Pakistan in May.
If McConnell tries to knock out a Democratic nominee tit-for-tat, Democrats won't accept a four-member commission, says Jim Manley, a spokesman for Senate Majority Leader Harry Reid of Nevada.
Each side had a man dismissed in that last encounter, while Diouf, Brown and Celtic manager Neil Lennon engaged in a bit of tit-for-tat mud-slinging in the days that followed.
For once, the attacks have not set off tit-for-tat accusations between the Afghan and Pakistani governments, as both countries deal with the extremists working to keep girls from getting an education.
If trade policies are deemed to hurt a tradig partner, a trade war can erupt, in which countries ratchet up protectionist policies in a tit-for-tat manner, ultimately leading to economic slowdown.
The Russian deputy foreign minister on Tuesday vowed a "targeted and appropriate" response to Britain's decision to expel four Russian diplomats in a tit-for-tat battle over the murder investigation of former KGB officer Alexander Litvinenko.
When the plague reappeared in Britain and on the continent in the 1660s, European countries used tit-for-tat quarantines to keep out competitors, skim fees from merchants, reassure trading partners and punish those who quarantined them.
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