People left in high spirits after watching a comedy film were able to work through 12 per cent more questions in timed maths tests.

Conversely, people who reported being in a sour mood were 10 per cent less productive than average.

Andrew Oswald, professor of economics at Warwick Business School, who led the research, said the results showed a clear relationship between mood and work efficiency – a discovery which could have profound implications for business leaders.

“We find that human happiness has large and positive causal affects on productivity,” he told The Observer.

“Positive emotions appear to invigorate human beings, while negative emotions have the opposite effect.”

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Happy workers ‘are more productive’