调查由作者和理论研究，考虑到开发商之间的竞争为环形竞争，而不是垄断性竞争。
Investigation by the author and theoretical research, consider the competition among developers for the ring of competition, rather than monopolistic competition.
另外，Waitrose与提供送货服务的网上超市Ocado展开了在M25（伦敦的城郊环形高速公路）内的竞争，Waitrose的网上杂货销售增加了54%，明年的增长速度有可能更快。
Online grocery sales climbed 54% and are likely to grow faster next year when Waitrose competes with home delivery specialist Ocado inside the M25.
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