Equity theory, most popularly known as equity theory of motivation, was first developed by John Stacey Adams, a workplace and behavioral psychologist, in 1963.
On average there are about 4.3 weeks in a month. Each week is 7 days, and there are normally either 30 or 31 days in a month, so there are usually between 4.2 and 4.4 weeks per month. The exception is February because it has fewer days, so there are about 4 weeks in that month. On average there are about 4.3 weeks in a month.
Although no calendar months have five weeks, it can be useful to know which ones have five Fridays, Saturdays or Sundays. To determine this, a person needs to know how many days the month contains and what day of the week it starts on. For a month of 30 days (April, June, September and November), the first two days will occur five times.