Answer:Megacities are classified by size (population over 10 million) whereas world city status is based on economic and political factors. Some cities such as New York are megacities as well as world cities. ... These 'million cities' include many cities in the developed world that are stagnating or declining.
The focusing of conscious awareness on a particular stimulus, as in the cocktail party effect (ability to attend selectively to only one voice among many). thats the answer
