[W + (D-d)] x TQ
N x NA
Where W is weather, D is debt, d is monthly salary, T is the time since Christmas, Q is the time since a failed quit attempt (like smoking or dieting), M is low motivational levels, and NA is the need to take action.
That’s the formula that Dr. Cliff Arnall, a seasonal disorders specialist at the University of Cardiff, Wales created for devising peoples lowest points.
The study was commissioned by a travel agency to help them understand what’s the best time for people to purchase that ticket to paradise.
