Big Mac & PPP Valuation Gap

Overview

A fundamental analysis pillar that evaluates currency valuation by comparing the relative cost of goods across different economies. It leverages Purchasing Power Parity (PPP) theory to identify overvalued and undervalued currencies for long-term forex prediction markets.

What It Does

This pillar calculates the 'implied' exchange rate between two currencies by comparing the cost of a standard basket of goods (like a Big Mac or OECD CPI basket). It then measures the divergence between this implied rate and the actual market exchange rate to generate a valuation signal.

Why It Matters

Exchange rates often detach from economic reality due to speculation or interest rate differentials, but they tend to revert to their fair value over time. This pillar provides a fundamental 'gravity' check, highlighting sustainable long-term trends that technical analysis often misses.

How It Works

The system aggregates price data for standardized goods from The Economist and OECD databases. It calculates the Purchasing Power Parity ratio and compares it against current spot FX rates. Finally, it adjusts for GDP per capita (the Balassa-Samuelson effect) to ensure fair comparisons between developing and developed economies.

Methodology

Calculates the Raw Index using the formula: (Price of goods in Currency A / Price of goods in Currency B) = Implied PPP Rate. The Valuation Gap is derived via ((Implied Rate - Actual Rate) / Actual Rate). We incorporate regression analysis against GDP per capita to normalize the data, smoothing out short-term volatility to reveal the fundamental trend.

Edge & Advantage

Provides a significant edge in long-duration binary options and range markets by trading on mean reversion when valuation gaps exceed 2 standard deviations from the historical average.

Key Indicators

• Raw Big Mac Index

  medium

  Simple comparison of burger prices to imply exchange rates

• GDP-Adjusted PPP

  high

  Valuation adjusted for productivity differences between countries

• Real Effective Exchange Rate (REER)

  high

  Weighted average of a currency relative to an index of other major currencies

Data Sources

• The Economist

  Bi-annual Big Mac Index data releases

• OECD Data

  Official Purchasing Power Parities and comparative price levels

• World Bank

  GDP per capita metrics for regression adjustments

Example Questions This Pillar Answers

• → Will EUR/USD close above 1.15 by the end of Q4?
• → Will the Japanese Yen strengthen against the USD over the next 12 months?
• → Which currency will be the best performer in the G10 basket this year?

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