Historical sales and demand are not equivalent when referred to periodicals, since the former are limited by the available stock. When the mean stockout is low and there is not possibility of updating data during the selling period, demand is estimated by means of a maximum-likelihood procedure....

We study cartel stability in a differentiated price-setting duopoly with returns to scale. We show that a cartel may be equally stable in the presence of lower differentiation, provided that the decreasing returns parameter is high. In addition we demonstrate that for a given factor of discount,...