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The universe would have expanded in a smooth way from a single point. As it expanded, it would have borrowed energy from the gravitational field, to create matter. As any economist could have predicted, the result of all that borrowing, was inflation. The universe expanded and borrowed at an ever-increasing rate. Fortunately, the debt of gravitational energy will not have to be repaid until the end of the universe.

Stephen Hawking#39

SciencePhysicsUniverseCosmologyEconomicsInflation

About this quote

What does it mean?
Hawking uses an economic metaphor to explain cosmic inflation and energy borrowing in the early universe.
In plain terms
The universe grew fast by borrowing energy, like a debt paid at the end.
What can you take from it?
Cosmic inflation can be understood through economic analogies.

Where it applies

  • physics education
  • science writing
  • public outreach

Putting it to work

  • use analogies for complex concepts
  • explain inflation simply
  • compare physics to daily life

Questions to consider

  • Why use economics to explain physics?
  • How do metaphors shape scientific understanding?

Another view

The debt analogy might mislead people about physical energy conservation.

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