If the lines are ‘blurred’ the right thing is to ask permission

From Michael Sukin. Sir, Pharell Williams was quoted in the Financial Times as saying: ‘There are songs that utilise other material, but until now there has not been copyright infringement’

A mistaken estimate of what QE can do

From John Hearn. Sir, In their letter to the Financial Times, 19 influential economists write that there are ‘better ways to boost eurozone economy and employment’

Do away with the noise to hear the signal better

From Stuart Fowler. Sir, Christo Leventis rightly points out that the forward price/earnings shares with Cape the characteristic of ‘smoothing the denominator of the ratio’

Singaporeans liberated in just one generation

From Jonathan Knowles. Sir, Your obituary of Lee Kuan Yew leads with the description ‘authoritarian’

Could someone translate Lee Kwan Yew to modern Greek?

From Richard Hale. Sir, Lee Kuan Yew said in 1968: ‘Adapt and adjust, without any whimpering or wringing of hands. The world does not owe us a living’

New institutions can be a force for good governance

From Robert H Wade and Jakob Vestergaard. Sir, Philip Stephens’s argument exaggerates China’s role

‘Grexodus’ offers more optimism than the spectre of ‘Grexit’

From Desmond Lachman. Sir, In referring to the possibility of Greece leaving the euro, your newspaper consistently uses the word ‘Grexit’

Ancient Rome gives us hope for American future

From Niccolo Caldararo. Sir, Mr Joseph Nye in his opinion piece asserts that ‘unlike ancient Rome’ the US is not in absolute decline

A welcome focus on a forgotten part of Europe

From Emil Ems and Per Magnus Wijkman. Sir, Thank you for Kathrin Hille’s informative article about Karelia

Heinz moves carried heavy cost in human capital

From Ernst Ligteringen. Sir, Your Lex article helpfully describes the magic used by Berkshire Hathaway and 3G to turn $18bn into $41bn

Harsh repression preceded Moors’ expulsion

From Michael Tracy. Sir, you imply that Moors were also expelled in 1492

A different approach to determining equity trends

From Nigel Lanning. Sir, Christo Leventis may well be right in concluding that US stocks are ‘expensive’ relative to history

Diversity brings real benefits to boards

From Michael D Lynch-Bell. Sir, I serve on four corporate boards and I am a trustee of ActionAid International

Ample evidence of the crazy business of football

From John Crane. Sir, ‘Premier League football clubs made their first collective profit for 15 years’ and ‘the world’s most commercially successful football league’ are both quotes from your article

A global framework will drive smart investment

From Daniel Mauro. Sir, A global framework to reduce carbon emissions would decrease demand for fossil fuels

Rugby union finale kicked boredom into touch

From George Horsington. Sir, Harry Eyres reckons that modern Six Nations rugby is ‘a boring succession of frontal charges, met by cast-iron defence’

Further evidence at Twickenham to support Osborne’s claims

From Tom Keatinge. Sir, George Osborne would have found further evidence to support his boastful claims of economic superiority by England over France

Cynical election tactics allowed world to see real Netanyahu

From Michael Colligan. Sir, Simon Schama’s, I assume, rhetorical question as to the ‘real’ Benjamin Netanyahu answers itself (‘Will the real Netanyahu please stand up?’)

Starbucks risks stirring up a dangerous brew

From Elizabeth Rohwer. Sir, I like the headline to Gary Silverman’s Comment (‘Big businesses aim to brew the right thing’), only I am afraid that it might turn out to be a dangerous brew

Callaghan had union input to consider in poll delay

From David Lea (Lord Lea of Crondall), Former Assistant General Secretary of the TUC

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