This is a story about big, and how one of the biggest construction projects in the world, the remaking of the Panama Canal, will let bigger boats sail into deeper harbors, where authorities are spending billions dredging channels, blasting tunnels and buying cranes from China the size of 14-story buildings to accommodate supersized cargo.

All this might knock a couple of dollars off the price of a smartphone shipped from Shanghai — or alleviate poverty in Panama, where the government plans to make a fortune in tolls — or create a windfall for the ports ready to receive the big ships, such as those in Baltimore and Norfolk. Va.

Or not. Nobody's sure, because no expert can predict with any certainty how the web of global trade routes will be redrawn, and who the winners and losers might be.