Answer:
2. For Joe income effect dominates while for Adam substitution effect dominates
Step-by-step explanation:
Income effect refers to change in the real i.e inflation adjusted income when prices change.
In the given case, Joe works at two jobs which means that for a greater income he is willing to work for more hours. Thus, in his case it can be said that income effect is prominent.
In the case of Adam, he works overtime regularly which means for every extra hour of work, he earns an extra income. This represents change in the relative income owing to change in working habits. This is a case of substitution effect.