What salary is considered rich in Boston?

Could you please elaborate on what constitutes a "rich" salary in Boston? Are we referring to a standard of living that allows for significant discretionary spending, or a threshold that signifies a certain level of financial comfort and stability? How does the cost of living in Boston, including housing, transportation, and other essentials, factor into determining what is considered a rich salary in the city? Additionally, are there any specific industries or professions that tend to offer higher salaries, and do these salaries correlate with what is considered rich in Boston?