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. For months with 31 days (January, March, May, July, August, October and December), the first three weekdays come up five times.