The United States and China have exchanged accusations of dumping for years and imposed tit-for-tat duties.
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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.
"For the first time, we are getting into a tit-for-tat syndrome, " he said.
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.
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.
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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