Measuring all tariffs as a percentage of the goods' value is a prerequisite for further progress in talks about reducing trade barriers for agricultural goods.

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Rich countries are loth to do more on farm trade until they see progress in talks on industrial goods and services.

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They can then be exchanged for virtual goods in a game within the app, while friends' progress can also be tracked.

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Even for a country like Brazil, agricultural trade barriers pose less of an obstacle to progress than barriers to trade in manufactured goods.

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Bubble Witch Saga is unique in that with the mobile version, all the progress a player has made in the game (whether virtual goods, level completion rating or status) will be synchronized across devices.

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For millennia, progress in infrastructure came from the more effective movement of the commerce in goods and services.

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So far, EBay has made more progress in its other two areas of future focus: social commerce and digital goods.

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