很多人知晓土豆皮健康有益，但是很少有人知道个中原因。
Most people know potato skins are healthy, but few are aware of the reason why.
而贫乏的市场和管理技巧及薄弱的基础也是个中原因。
Poor marketing and management skills and poor infrastructure are also blamed.
要明白个中原因，依次想想世界上三大经济巨人居然就知道了。
To understand why, consider each of the world's three largest economic powers in turn.
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