Walmart clearly falls under a geographic area. There's a physical store. You can measure the competition in that geographic area and you can look at what other

Walmart clearly falls under a geographic area. There's a physical store. You can measure the competition in that geographic area and you can look at what other choices consumers have. An iPhone is clearly a different case. Measuring what options users have is not limited by a geographic region but by what policies and app stores govern the device.