Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Hegwood and Papell (2002) conclude on the basis of analysis in a linear framework that long‐run purchasing power parity (PPP) does not hold for 16 real exchange rate series, which were analyzed in Diebold. I lusted, and Rush (1991) for the period 1792‐1913 under the Gold Standard. Rather, PPP deviations are mean‐reverting to a changing equilibrium—a quasi PPP (QPPP) theory. We analyze the real exchange rate adjustment mechanism for their data set assuming a nonlinear adjustment process allowing for both a constant and a mean shifting equilibrium. Our results confirm that real exchange rates at that time were stationary, symmetric, nonlinear processes that revert to a nonconstant equilibrium rate. Speeds of adjustment were much quicker when breaks were allowed.