Usually classroom desks are arranged in rows or columns, but there are many more ways to arrange the desks, for example making a circle with the desks so that it's more of a group discussion or having the desks in a U shape for group discussions and easy access for the teacher.
Uber Prevents Drunk Driving: Advantage Over Taxis. What is Uber. Uber, as you all know, is a specially made mobile app, which allows you to interact with other on-the move travelers and drivers alike sharing information related to road navigation and mobility.
What are Uber's competitive advantages? As far as I know, their technology is not that complicated and easily copied. The supply of people with cars willing to give rides for the right price is almost infinite. Sure, user experience and convenience are important but those too can be easily replicated. There don't appear to be many network effect benefits besides the name 'Uber' becoming synonymous with calling a private car.