The first step to ensuring the safety of your food supply is keeping track of when you purchased and opened each item.

第一步，为确保安全，当您购买和和打开每个食品前，应对您的粮食供应是保持跟踪。

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As products flow through the supply chain, these sensors detect their presence and report the identity of the item and time it was seen.

当产品在供应链中流通时，传感器将检测到它们的出现并报告产品出现的时间及其身份。

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Supply and demand have little to do with a seller’s decision to price an item at $19.99 instead of 20 bucks.

当商家觉得价格应该是19.99美元而不是20块时，供求关系并没有起到什么作用。

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Let's go back to Econ 101: When you constrict the supply of an item and have constant or increasing demand, price must increase.

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Or the toothpaste, medical supply or pawned item for that matter.

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Developed by Hannes Harms, a design engineering student at the Royal College of Art in London, these little markers would allow consumers to trace the entire supply chain behind every item in their cupboard, while feeding valuable nutritional information to dieters or people with particularly dangerous food allergies.

ENGADGET: NutriSmart prototype embeds RFID tags directly within food, traces your lunch from start to finish (video)