In pricing theory, the scarcity principle suggests that the price for a scarce good should rise until an equilibrium is reached between supply and demand. However, this would result in the restricted exclusion of the good only to those who can afford it.
Children aged between three and seven should be limited to half-an-hour to an hour of screen time each day, he said. Those aged seven to 12 should spend just one hour in front of screens. Children aged 12 to 15 should have a maximum of 1.5 hours in front of screens and those aged 16 and over should spend just two hours, he recommends. ''Reducing total daily screen time for children, and delaying the age at which they start, could provide significant advantages for their health and wellbeing,'' he writes.
It found that children spend more time in front of a screen in one day than they spend exercising in the entire week. The worrying research found that 97 per cent of 11 to 16-year-olds own a mobile phone â eight per cent more than the percentage of adults who own one.hildren in Britain sit in front of a TV or computer screen for four-and-a-half hours a day, alarming research reveals. Youngsters now spend an average of one hour and 50 minutes online and two hours 40 minutes in front of the television every day.