PUBLIC MARKS with tag ecosystem

Thoughtful article about the mobile apps ecosystems

Consider this. Last year, Apple sold 32 million iPods, or one every second. But for every $3 spent on an iPod, at least $1 is spent on an accessory, estimates Steve Baker, an analyst for the NPD Group, a research firm. That works out to three or four additional purchases per iPod. That obviously makes accessory makers happy. It thrills retailers, whose profit margin on the accessories is much higher than on an iPod. And it delights Apple because the racks of add-ons made just for the iPod — 2,000 different items at last count — send a strong statement to consumers that the Apple player is far cooler than a Creative or Toshiba player, for which there are few accessories.

Blueberry Farm is a computer program that models a simple ecosystem. It was designed to be used as part of a sequence of science lessons aiming to help Yr7 pupils understand more about the use of chemical agents in farming and how these can affect ecosystems.