is the fact that one of them is selling at one of the end of the town,

是由于一家公司在城的一边销售
and the other one is selling at the whitehead end of town.

而另一家公司在城的另一边销售
But actually,

而实际上
we could consider this model more generally,

我们可以把这个模型想得更普遍些
and let's just do so briefly here.

我简单在这讲一下
So let me just redraw the town; here's my town again.

我重新画这个城这是我的城市
I don't have to regard this product,

我不一定要将这个东西
this line as being distance along the high street of the town.

这条线想象为城中大街的距离
It could be something else about the product.

它可以是产品的其他方面
So, for example,

例如
in whatever it is you guys imagine makes Coke and Pepsi different,

你们所认为的可口可乐和百事可乐的不同
it could be that thing.

它可以是那个不同