Game theory: The restaurants in Timbuktu either sell low quality or high quality food. It is well-known that only 10% of the restaurants sell food of high quality. The restaurant can either invest in advertisement and a nice ambiance ("ad") or not ("noAd"). The tourist then can decide whether to eat in that restaurant or to ignore it. Payoffs of the game are as follows:

(a1, a2 High Quality Low Quality ad,eat) 10,100 5,-5 ad,ignore -10,5 0,5 noAd, eat 15,50 10,-10 noAd,ignore -10,5 0,5