This research examines whether mandatory price reporting (MPR) impacted
price relationships among U.S. hog markets. Markets are cointegrated before
and after MPR enactment, but not fully integrated in either period. Terminal
markets adjust to shocks in the Iowa-Southern Minnesota market more quickly
and Iowa-Southern Minnesota prices adjust to shocks in terminal markets more
slowly following MPR enactment. Granger causality tests indicate a causal
flow from terminal markets to Iowa-Southern Minnesota prices before MPR and
a causal reversal after MPR enactment. These results likely reflect
decreases in volume of negotiated sales, particularly in terminal markets,
and greater reliance on mandatorily reported prices for market
information.