Group 1 - The core idea of the article is that the evolution of monetary theory from simple observations to systematic analysis has significantly contributed to understanding the complex relationship between money and the economy [1][2]. Group 2 - In ancient Greece, philosopher Xenophon noted that an excess of gold would lead to its devaluation, while silver prices would rise, marking one of the earliest records of the quantity theory of money [3]. - The 16th century saw a "price revolution" across Europe, where scholars like Copernicus observed the destructive impact of currency devaluation on national economies, linking it to the oversupply of money [5]. - Salamanca University scholar Azpilicueta proposed a systematic view that linked the quantity of money to price levels, suggesting that countries with abundant money experience higher prices, thus influencing economic activities [7].