As much as 12%% of the daily volume on the New York Stock Exchange, and similar volumes on other major world exchanges, involves sales by institutional investors to brokers through blind portfolio auctions. Such transactions typically take the form of a first-price sealed-bid auction in which...

A collaborative filtering system recommends to users products that similar users like. Collaborative filtering systems influence purchase decisions and hence have become targets of manipulation by unscrupulous vendors. We demonstrate that nearest neighbors algorithms, which are widely used in...

Many recommendation and decision processes depend on eliciting evaluations of opportunities, products, and vendors. A scoring system is devised that induces honest reporting of feedback. Each rater merely reports a signal, and the system applies proper scoring rules to the implied posterior...

Most large organizations allocate resources by means of fixed budgets: each subunit is normally entitled to spend a defined amount over a fixed period, usually one year. Fixed budgets create clear incentives for subunits to control costs. Yet such arrangements create major incentives for dynamic...

The seller posted-price procedure is probably the most common method for making transactions in modern economies. We analyze the performance of posted pricing for transactions having significant common-value elements. In a model of two-sided private information, we characterize the fully...