FIGURE 15.5

There Is Trouble with the Trees Each tree grows tall to try to grab up all the light. But when all the trees do, none gain an advantage and all expend resources in fruitless competition. iSTOCK/360/GETTY IMAGES

The Arms Race Few people wanted to develop the hydrogen bomb but no one wanted the other side to develop it first so we ended up in a very dangerous world. iSTOCK/360/GETTY IMAGES

Battle of the Brands Coke and Pepsi have spent billions trying to convince buyers that their brand is better. The war has been profitable … for the advertising agencies. RODNEY TURNER KRT/NEWSCOM

Standing Room Only At the concert everyone stands to get a better view but no one gets it (unless you have a very good friend). FRANZ PFLUEGL/SHUTTERSTOCK