Economics is the study of how societies use scarce resources to produce valuable goods and services and distribute them among different individuals. If we think about the definitions, we find two key ideas that run through all of economics:

能源的未来不在于燃烧过去，而在于用明天的创新为现在提供动力。

"The past is a foreign country; they do things differently there."

The stimuli which are allowed in are not connected by just simple one-to-one switches to the outgoing responses.

没有执行的创新只是空想。