Soybean prices were supported by the weaker U.S. dollar and the potential for labor problems in Argentina as farmers, processors and exporters try to handle the huge record crop. Meanwhile, the July contracts of all three wheat futures markets closed higher. General Comments Economists had expected that the U.S. economy slowed during the first quarter of 2015, but the Commerce Dept. reported this morning that first quarter gross domestic product (GDP) growth was well below expectations. In fact, it hardly grew at all. Pre-report guesses were that it rose 1.0 percent. However, the report showed growth at a mere 0.2 percent due to shrinking exports and lower business investment. That compares to growth of 2.2 percent in the fourth quarter o...