Per Juan de Dios Tena , a statistics professor at Carlos III University: "Migration flows are closely linked to psychological issues related to happiness," that is, people tend to leave a country if it lacks the conditions for their happiness, in favor of someplace where they think they can be happy. 
Per Juan de Dios Tena , profesa wa takwimu katika Chuo Kikuu cha Carlos anasema: "Wimbi la Uhamiaji lina uhusiano na masuala la kisaikolojia yanayohusiana na furaha," yaani, watu huhama nchi kama wanakosa mazingira ya furaha, na hivyo kupendelea maeneo mengine wanayodhani yatawapa furaha.