Suppose individuals react to the threat of getting infected by COVlD by reducing their social activity. Denote person i's level of social activity as a,- E [0.1]. Further denote the average activity level in the society as EL. A person's resilience to the virus is given by 49,-. The disutility an infection causes for person i is 1/6,. Finally, the infectiousness of the current variant is given by p. A person chooses her activity level in order to maximize her enjoyment from social activity net of expected health consequences of an infection. The probability p,- of contracting the virus depends on activity level, average activity level in the society and on the infectiousness of the variant. Hence, the objective function of person i is Pdai, 5!; P) EU(a.-,a) == m.) 6, For simplicity use the following functional forms: pi (aii a) = Pagay at) 2 \"i