
U.S. soybean futures fell more than 3% on May 18, 2017, after Brazil's real dropped over 7% following corruption allegations against President Michel Temer. Corn and wheat followed soybeans lower.
Brazil had just completed a record soybean harvest, and farmers had sold only about half of it by early May.
A weaker real makes Brazilian soybeans cheaper in dollar terms and encourages farmers to sell their large unsold stocks, adding competitive pressure on U.S. soy and corn export prices.
After 301 past bullish macro events, Brazilian Real (BRL per USD) moved a median +0.4% over 5 sessions (57% higher; middle half -1.2% to +1.7%), and +1.0% over 20.
After 69 past bearish macro events, Wheat (SRW) moved a median -0.5% over 5 sessions (35% higher; middle half -2.6% to +0.8%), and -0.7% over 20.
After 301 past bearish macro events, Corn moved a median -0.1% over 5 sessions (47% higher; middle half -2.2% to +1.3%), and +0.2% over 20.
After 273 past bearish macro events, Soybeans moved a median -0.4% over 5 sessions (44% higher; middle half -2.4% to +1.4%), and -0.5% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.
Confirms the real fell over 7% on corruption allegations on May 18, though its main focus is the soybean price effect, a consequence of the move.