Structural balance is a simple equilibrium model of positive and negative relationships, such as friendship and enmity. Some relational patterns (e.g. friends sharing an enemy) are balanced; others (e.g. enemies sharing a friend) are not. The model has tested well in a variety of applications, from...

Bounded rationality assumes a utility function but not maximization. Simon’s version is satisficing. Another, attributable to Luce, is maximization to within a threshold of discrimination. Framed as conditions on a choice function, each with weak and strong variants, the two versions of...

A portrayal of the bill-to-law provisions of Latin American constitutions as extensive game forms shows presidential veto powers to be richer, more varied, and more regionally distinctive than hitherto appreciated. Small details and apparent redundancies are surprisingly consequential, the...