This article analyzes a call market that enables conditioning not only on an asset price but also on an index (a weighted average of stock prices) that is determined simultaneously with the prices of all assets. The authors compare two trading systems, with and without index conditioning, and...

In many stock exchanges around the world there is a "call" or "batch" transaction at the opening of the trading day. Currently, an essential problem in the application of this trading mechanism is that orders in one security cannot be conditioned on prices of other securities. As a result,...