In every one of the 53 countries surveyed, people typically expressed self-esteem above the midpoint of the most widely used self-esteem scale. this best illustrates the pervasiveness of

self-serving bias

Explanation:

Self-service bias appears when people claim more responsibility for their own successes than their own failures. It also manifests itself when people have the tendency to evaluate ambiguous information in a way that benefits their own interests. Attributing failures to external factors often diminishes the feeling of inefficiency and self-esteem will not be too affected.

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.