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.
The researchers found that the number of minutes with media is almost identical for every age group. Mr. Wakshlag called the amount of time âamazingly consistent across the age groups.â Except, that is, for 45-to-54-year-olds, who spend on average an extra hour in front of screens each day, the study found. âIt flies in the face of conventional wisdom, of course, which tells us that the younger cohorts apparently spend more time with screen-based media,â said Michael Bloxham, a director of the center at Ball State.