Which of the following was not an outcome of a higher wage? a. buy more products c. creating of a new class b. invest in stock markets increased d. high product prices

The correct answer is C: "creating of a new class".

A is correct

If the wage level increases, then the purchasing power of employees increases too, and these are able to buy larger quantities of products.

B is correct

When the wage level increases, so does the income of the individuals who receive it. This larger income can be dediced either to consumption or to savings and investments. One type of investment where the wage rise can be directed is the purchase of shares in the stock markets.

D is correct

If the wage level increases, the cost incurred for the manufacturing of the product also becomes larger (the salary of the employee working in the production process has risen). Therefore the producer needs to charge a higher price if he wants to maintain the former level of profits.

Then letter C is the incorrect one.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

the answer to your question is,

d. when a child was born.

-mabel < 3