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Chapter 922 - 533: Celebration, Human Technology Advancement Plan Part 2
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... y when a civilization develops to an advanced stage.
Even before the Abyss Era, oil represented energy resources, valued equivalent to hard currency.
As the level of civilization continues to increase, the status of energy as hard currency becomes higher.
For instance, on that abandoned industrial planet of the Sikes Civilization, Sikes citizens left behind on the deserted planet used batteries as hard currency.
The essence of batteries as hard currency is still r ...
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