That's what makes competition".
Besides magnifying differences, the politics of enmity makes competition viscerally personal.
The rapid increase in travel demand makes competition between air and ground transportation silly and counterproductive".
"The density of the animals on tropical reefs makes competition inevitable and extreme," he says.
"The explosion of cellphone usage - especially smartphones - makes competition in this market more important than ever as a check on prices, consumer choice and service".
Another likely culprit, though, is the regulation of product markets: if regulation makes competition less intense, it blunts companies' incentives to raise productivity and thwart their rivals.
Unlike other sports, though, there are no reserve leagues in the NFL, and this makes competition for places on each team's 53-man roster incredibly tough.
This makes competition within the industry very intense.
These issues make competitions easy targets for ridicule.
City governments, schools and day care centres around the country will participate in parades, poster making competitions, poetry and song writing contests; and handwashing demonstrations.
