Market Expectation Gap

Market expectation gap is the difference between a piece of news and what market prices had already expected before that news became visible. Cockroaches 1, Modi 0: India’s remarkable protests adds the concept through the Advance News Trading Experiment, where people saw tomorrow’s headlines but still guessed market direction only slightly better than chance.

The concept explains why better information does not automatically become Investment Edge. A headline can be objectively important and still move markets in the opposite direction if prices were positioned for something even worse, if policy expectations dominate, or if the trader chooses the wrong asset expression.

The source pairs this with Position Sizing: even when a trader reads the expectation gap correctly, too much leverage or poor confidence calibration can still destroy the result.

Connections

• Advance News Trading Experiment - empirical case in the source.
• Josh Roberts - correspondent explaining the expectation problem.
• Investment Edge, Position Sizing, and Investment Risk Management - practical investing concepts affected by expectation gaps.