Maritime transport costs have a significant impact on the trade in agricultural goods. Maritime transport costs represent a high proportion of the imported value of agricultural products --10% on average, which is a similar level of magnitude as agricultural tariffs. This study shows that a doubling in the cost of shipping is associated with a 42% drop in trade on average in agricultural goods overall. The tendency to source imports from countries with low transport costs is therefore strong. Trade in some products is particularly affected by changes in maritime transport costs, in particular cereals and oilseeds, which are shipped in bulk. Time spent in transit also has a strong effect on trade: an extra day spent at sea on an the average sea voyage of 20 days implies a 4.5% drop in trade between a given pair of trading partners. Not only cost but also efficiency in getting agricultural goods to market are therefore important factors in explaining trade flows.

As tariffs have fallen, it is apparent that trade costs are a significant obstacle to international trade and that they vary from country to country. The gap between the cif and fob value of a trade flow is a useful measure of aggregate trade costs, but only if the measure is based on a consistent volume of trade; mirror statistics are unsuitable. Using high quality Australian import data disaggregated at the HS 6-digit level, we find large country-by-country variations in trade costs. Distance, weight and size account for part of the variation in trade costs. Indicators of institutional quality pick up some of the variation in trade costs, but the relationship is not uniform across mode of transport and commodities; exporting countries' institutional quality is more strongly related to trade costs for air freight than sea freight, and the relationship is commodity-specific and strongest for manufactured goods. Country-specific characteristics influencing trade costs provide a link between institutions and economic development.

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