But, as Professor Richard Layard of the London School of Economics has argued in his recent book Happiness: Lessons from a New Science , promoting friendship is often easy, cheap, and can have big payoffs in making people happier.
Mais comme le soutient le Professor Richard Layard de la London School of Economics dans son livre paru récemment Happiness : Lessons from a New Science , promouvoir l’amitié est souvent facile, peu coûteux, et rendre les gens plus heureux peut être fort gratifiant.