Although Likert scale is numeric, it is intrinsically ordinal (1 – Strongly disagree to 5 - Strongly agree). Even ordinal, due to convenience it is usual to use a t-test to evaluate whether two groups are significantly different (testing population mean with unknown variance). In this paper I...

Although it is an empirical regularity that in the trading of homogeneous goods there are persistent price dispersion and competition between sellers, it is theoretically derived that when buyers are optimisers, in market equilibrium, there are neither price dispersion nor competition (the...

It is unquestionable both theoretically and empirically that trade in competitive markets is the best way to promote the efficient allocation of goods. Nevertheless, there could be some traders' strategies that interfere with competition, collusion among traders, which results in losses to...

In this paper, I intend to model a firm decision of entrance into a profitable fashion market where fashion results from the existence of positive interdependence between buyer's utility functions. I conclude theoretically that i) when incumbent firm has an aggressive strategy it sets a...

Varroa destructor is a parasitic of honeybees that, beginning in the 1960´s, has become a worldwide serious economic problem. Although there are miticides capable of controlling the infestation they contaminate the honey. In this paper I question if it is possible to implement a perfectly...

One important issue in firms' governance is how to incentives so that activity centres can become more efficient. In this paper, we first introduce an agency contract where the salary of the manager of an activity centre that produces an intermediate product is dependent of its performance....