Shopping may be beneficial because it involves changes of scenery from shop to shop, which improves the child's motor and social skills more than a sedentary（久坐的） activity, the report continued.

Reading and storytelling together ranked high for happiness, but being left to read on their own, or watch TV, had a 'negative impact' on the child's development.

Professor Anand from the Open University said that during shopping trips 'children are getting visual stimulation, they've getting out of the house and into a new environment.

'They're bumping into other families where social skills come into play and they may get the chance to do something physical in a shop like run around.'

The researchers now want to test their theories on older children to see what activities influence development among other age groups.

The research was presented at the annual conference of the Royal Economic Society.

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