It takes the Earth one year to orbit the Sun and it takes Mars about 1.9 years (say 2 years for easy calculation) to orbit the Sun. The elliptical orbit which carries you from Earth to Mars is longer than Earth's orbit, but shorter than Mars' orbit.
Equity theory was first developed in 1963 by John Stacey Adams, a workplace and behavioral psychologist, who asserted that employees seek to maintain equity between the inputs that they bring to a job and the outcomes that they receive from it, against the perceived inputs and outcomes of others.
Equity Theory. Equity Theory within Process Theory measures work motivation by the amount of skills an employee possesses and the efforts of the employer. When an employee feels that she and her employer have made equal investments in each other, she is more likely to feel motivated.