Diminishing marginal utility is an important principle of economics,but in the network economy,increasing marginal utility will deal a blow to this principle.

Focuses on the new economic phenomena existing in the knowledge economy,especially analyses the two reasons which cause the phenomena of increasing marginal utility:the repeatable demands and the crossing demands.

Analysis of the structure,the characteristics and the domino effect of reward progressive increase in the knowledge-intensive enterprise;

The present research aims to explore the influence of time management disposition on learning satisfaction, further to verify the incremental validity.

It does have some practical value to enhance the incremental validity by studying the construct validity of interview.

Leaderless group discussion had significant predictive validity in leadership task performance,and an incremental validity in leadership task performance as compared with behavioral interview.