Wadōkaichin — The Economic Revolution Sparked by Japan's First Coinage

In the first year of Wado (708), Japan ushered in a new era. That year, the discovery of natural copper, known as 'Wado', in Chichibu, Musashi Province, dramatically changed ancient Japan's economy. During this period, as the Taiho Code was being implemented and a centralized state system was being established, copper as a new resource promoted the establishment of a currency system. In response to the discovery of Wado, the government changed the era name to 'Wado' and decided to mint 'Wadōkaichin'. This was against the backdrop of attempts during Emperor Tenmu's era to establish a currency system based on China's Tang dynasty system, facing resource shortages. The discovery of Wado was the very solution to this problem. Furthermore, the Nagato Copper Mine in Yamaguchi Prefecture was also noted as a major source of copper supply. The Nagato Copper Mine was the first fully developed copper mine in Japan, and immigrant craftsmen from the continent were involved in its mining and smelting. Their technology significantly enhanced Japanese copper production, enabling the manufacture of Wadōkaichin. Thus, the first year of Wado marked a significant turning point in Japanese politics and economics, with geographical and technological factors intricately intertwined.

The minting of Wadōkaichin was more than just the production of currency; it was a project that combined the technology and wisdom of people. At the Nagato Copper Mine, mined copper ore was smelted and processed into copper plates. These processes required the advanced skills of craftsmen who immigrated from the continent. They brought Tang's advanced technologies and introduced smelting techniques to improve copper purity in Japan. Especially, the design of smelting furnaces and temperature control technology were groundbreaking in Japan at the time. The minting site was established in Heijō-kyō, Nara, where copper plates were cast into the shape of coins. The design of Wadōkaichin is said to have been inspired by Tang's Kaiyuan Tongbao, characterized by its square hole in the center. This design greatly influenced later Japanese coins. Workers involved in the minting processed vast amounts of copper daily, striving to meet targets. Wadōkaichin was realized through the technology and efforts of such people. This minting process promoted the development of Japan's industrial technology, laying the foundation for the economy in later periods. Details of Edo Silver Coins can also be viewed.

Once Wadōkaichin was minted and circulated, its impact spread rapidly. The government began collecting taxes using these new coins and encouraged their circulation in the provinces. However, initial circulation was not easy. Many people were accustomed to bartering and felt awkward about using coins. It took time to understand the value of Wadōkaichin. Nevertheless, gradually the benefits of a monetary economy were recognized, and market transactions became more active. For example, an exchange rate was set where 1 Wadōkaichin was exchanged for one shō of rice, facilitating efficient trading. This made it easier for local goods to gather in the center, promoting national economic integration. However, limitations in copper production led to a decline in the quality of later imperial coins. This change affected people's lives significantly, making transactions using coins commonplace. Thus, Wadōkaichin fundamentally transformed Japan's economy, laying the foundation for a monetary economy. Types of Anasen and How to Identify Them can also be referred to.

The minting of Wadōkaichin was a major turning point in Japan's coinage history, and its influence extended significantly to later generations. Following Wadōkaichin, many imperial coins were minted, but their quality was not always consistent due to copper supply shortages and technical problems. Particularly as the Heian period began, the decline in copper production resulted in lower quality copper coins. As a result, coins minted as successors to Wadōkaichin struggled to maintain value, causing occasional distribution confusions. Later monetary systems repeatedly recast coins, seeking stability based on these experiences. However, the significance of Wadōkaichin was very large in establishing the foundation of the currency system in Japan. Even in modern evaluations, Wadōkaichin is considered an important legacy that laid the foundation of Japan's coinage system, still holding great appeal for collectors and researchers. Thus, Wadōkaichin is more than just currency; it remains a significant symbol in Japan's economic history, still told today. Detailed Explanation of Wadōkaichin is also worth a look.