Final answer:
The consultant should focus on her high-income consulting work due to the principle of specialization of labor, which suggests maximizing income through skilled work and purchasing vegetables instead.
Step-by-step explanation:
It makes more economic sense for the consultant, who earns $200 per hour, to spend her time at the consulting job rather than growing vegetables because of the principle of specialization of labor. She is very productive in her consulting work, generating significant income in comparison to the value she could create by growing vegetables.
As she is not very good at horticulture, the time spent on farming would result in a much lower economic yield than her professional work. By focusing on consulting, she can maximize her income and then purchase vegetables, better allocating her time and resources towards what she does most effectively.