The world is composed of matter, energy, and information. Matter is the entity, energy drives change, while information is the 'data' that describes all of this.

From this perspective, the essence of currency is a special kind of number. It is the core tool for human society to digitally record the flow of material wealth and energy.


1. From entity to symbol: the journey of currency's 'digitization'
Initially, currency itself was physical (such as shells or livestock), it was the material itself. Later, gold and silver became the standard due to their stability and scarcity, but they were still physical, and the core of physical currency is also the corresponding number (such as 1 gram).

The real revolution was the emergence of paper money, a piece of paper itself has very low value, but it represents the digital claim to a certain amount of gold or wealth.

From then on, currency began to decouple from specific materials, evolving into a purely credit symbol and bookkeeping unit — that is, numbers.


2. How do numbers record the world?
In the modern economy, all goods and services (which are forms of the transformation of matter and energy) require a common standard of measurement to exchange and compare. Currency is this standard.

A house, a dinner, an hour of labor — these distinctly different contributions of matter and energy cannot be directly added together.

But through monetary pricing (such as 1 million, 50 yuan, 100 yuan), they are transformed into homogeneous, comparable, and calculable numbers. The operation of the entire economy is reflected in the flow and change of these numbers.



3. Digital currency is the ultimate proof
Today, we have entered the era of digital currency. Bank card balances, mobile payments, cryptocurrencies... these are all purely digital stored in electronic devices.

They have no physical form, yet can command the precise flow of materials (goods) and energy (services) in the real world.

This powerfully proves: the core function of currency is no longer that 'thing', but the 'digital information' it carries, which is universally trusted.

Therefore, currency is numbers. It is humanity's greatest invention of a 'bookkeeping system', mapping the complex and diverse material world into a concise, computable digital language.

Understanding this, one can comprehend: the essence of finance is the flow of digital information; the health of the economy requires that the growth of these numbers must reflect the creation of real material wealth and energy. Otherwise, no matter how large the numbers are, they are just baseless illusions.

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