All in a day's work

Every working day, the Baltic canvasses brokers around the world and asks how much it would cost to book various cargoes of raw materials on various routes—150,000 tons of iron ore going from Australia to China or 150,000 tons of coal from South Africa to Taiwan. Brokers are also asked to consider variables such as the type and speed of the ship and the length of the voyage.

The answers are melded into the BDI, which appears in shipping publications such as Lloyd's List and on the screens of information vendors such as Reuters and Bloomberg. Because it provides "an assessment of the price of moving the major raw materials by sea," as the Baltic puts it, it provides both a rare window into the highly opaque and diffuse shipping market and an accurate barometer of the volume of global trade.

The BDI is a good leading indicator for economic growth and production. After all, it doesn't deal with container ships carrying finished goods. It deals with the precursors to production: bulk carriers carrying building materials, cement, grain, coal, and iron. Unlike stock and bond markets, the BDI "is totally devoid of speculative content," says Howard Simons, an economist and columnist at TheStreet.com. People don't book freighters unless they have cargo to move.

Because the supply of cargo ships is generally both tight and inelastic—it takes two years to build a new ship, and ships are too expensive to take out of circulation the way airlines park unneeded jets in the Arizona desert—marginal increases in demand can push the index higher quickly. And significant increases in demand can push the index sharply higher.

- Daniel Gross

The index is also seen as a good economic indicator of future economic growth and production, termed a leading economic indicator because it predicts future economic activity.

- Wikipedia

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