http://www.grainews.ca/news/u-s-soybeans-fall-wheat-pares-gains-on-macro-worries/1001782004/

This article is so cool, since it contains lots of information:

-soybean future fell last week

-wheat and corn future up last week

-wheat and corn are riskier

-corn price experienced the largest weekly rise since august

-wheat rose the biggest advance since July

-soybeans were pressured after report of larger plant of soybean

-most traders and analytics focus on the weather condition of South America

-Ukraine’s supply and demand has big influence on price of future market

In this article, the writers also use microeconomic and macroeconomic concern to explain what happened and why it happened. It also pointed out that because of the centuries drought in America, the demand side settle their hopes on South America, Brazil and Argentina. If there will be bad weather, then the shortage in future could be a reasonable prediction.