We baby boomers grew up in an age of finite pie. There was only one pie and it could be divided into only so many slices. Even our pie graphs represent the totality of the resources we have to work with. There's only so much pie to go around. And the implications play out in how we think, act and define success. If you only have one finite pie, what flavor is it? How many people can it serve? How small can you make the slices? What does it mean if you simply don’t have enough?
All of this is a legacy of the Industrial Age, which was based on the availability of natural resources to feed growth. Empires were built by gaining access to raw materials that could fuel their economic engines. You could not sustain industrial success on finite resources, so you kept expanding the size of your pie. Of course, this works well as long as there are new lands to acquire and new resources to consume. But in the physical world, there are always limits. Be it foreign lands or fossil fuels, everything runs out eventually.