As food prices soar, big agriculture is having a field day

Even as demand for crops has surged, a confluence of factors has conspired to squeeze global supply. Droughts in North and South America have curtailed output. Brazil’s winter-wheat harvest is down by a fifth—and that fifth was meant for export. Besides the container shortage that affects specialty crops such as coffee, the grounding of commercial flights is stranding fresh fruit and vegetables. Rising bulk-shipping rates, up by 150% this year, are adding to the squeeze.