Freight & Transportation Indices
Freight indices track the cost and volume of moving goods from producer to buyer. For physical-goods sectors such as mining, agriculture and industry, logistics is a direct cost line; these indices are also a widely watched pulse of global trade.
Freight indices measure the cost and volume of moving cargo. The Cass (North American truck/rail/air), BTS (US multi-modal) and overseas ocean freight PPI series are published monthly; they are trend indicators, not absolute prices.
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4What do freight indices show?
The Cass shipment index tracks the volume of freight moved, while the expenditure index tracks total payments (volume × price); their divergence reveals the change in unit freight cost. The BTS index combines truck, rail, water, pipeline and air cargo. The overseas freight PPI shows ocean-shipping price trends. Spot ocean rates such as the Baltic Dry Index are not included because no free/licence-compatible feed exists. All series are monthly reference values; past trends do not indicate future performance, and this data is not investment advice.