Scientists are still a long way from fully understanding the psychological effects of video games.

answer; ///product strategy;

i have economics during second block which is easy to me. anyways, i think b.

consumer credit. an advantage is that it allows consumers to afford expensive goods and services now, increasing their standard of living. however, a disadvantage is that it creates a trap for debt, if people do not have self control, they may see themselves filing personal bankruptcy.