We construct an algebraic model of the social choice theory. First we give an arithmetic proof of Arrow’s Impossibility Theorem. Next we apply our algebraic method to single-peaked preference domain to establish two theorems. (i) A value of Arrovian social welfare function on single peaked preference domain is single-plateaued with at most two maximal elements. (ii) An ordering by majority voti...

We study mechanisms where a player’s strategy is one of his possible (payoff) types and at least one player is Knightian, that is, cannot distinguish which element of a “candidate set” with multiple types is his true type. We call such a mechanism Knightian truthful if, in all its rational plays, every player reports his own true type, if he knows it exactly, and a type in his candidate set, if...

The Family Options Study provides an unprecedented opportunity to investigate the troubling link between family homelessness and child maltreatment. The rigorous design uses multiple methods to probe the impact of housing interventions on family preservation and reunification and the underlying mechanisms. Results show that ending homelessness keeps families together; however, once separated, f...

Professionals may have agendas that conflict with the person under their care as their dominant consideration is often safety. This may arise from a genuine concern about welfare, but may also involve fear of litigation from an adverse incident following discharge.

High and persistent unemployment has presented a major challenge for the welfare state from two directions. First, it has eroded the funding base and second, it has increased the demands on welfare programs because of the consequences for poverty and inequality resulting from high unemployment. This paper explores these latter effects using a range of national and international evidence. It is ...

We show that the many unusual features of China’s financial markets are consistent with a government choosing regulations to maximize a standard type of social welfare function. Under certain conditions, these regulations are equivalent to imposing explicit taxes on business and interest income, yet should be much easier to enforce. The observed implicit tax rates are broadly in line with those...

in this study, the social welfare impacts of the interaction of iranian rice import policies and thai export policies are analyzed using a game theoretic approach in conjunction with econometric supply and demand models. the joint impacts of increasing the world price of rice, resulting from the export policies in thailand along with changes in tariff rates in iran, on social welfare are analyz...