Maeil Business Newspaper and Yes24 analyze the sales status of investment and investment books. Domestic stock-related books have been selling well since November last year. The number one purchaser among all age groups is men in their 40s. Even minors are attracting attention for purchasing investment books. Purchases of investment books by people in their 20s are low. In the era of '5,000pi', sales of investment and financial technology books have soared explosively compared to previous years. In particular, sales of 'domestic stocks' books have soared by more than 200% compared to the same period last year, and the book market has recently been driven by financiers who want to study 'Kukjang'. Purchases of investment and investment books by teenagers who have not yet reached the age of majority also showed a slight increase, and it is expected that 'teenagers' will emerge as a new variable in the investment and investment book market, which has been considered the exclusive domain of adults. On the 3rd, the Maeil Business Newspaper commissioned Yes24 to examine the 'sales status of investment and investment books' and found that sales of investment and investment books for the three months from November last year to January this year increased 28.2% compared to the same period last year, and sales of domestic stock books, a subfield, surged 235.7%. Domestic stock investors' purchases of related books have continued a clear upward trend since the second half of last year. Sales of 'investment and finance books' between November 2025 and January 2026 increased by 38.5% compared to October and December 2025, and among these, sales of 'domestic stock books' increased by 147.6% during the same period, which is interpreted to indicate that interest in 'National Director' is increasing day by day. Oh Da-eun, PD in charge of Yes24's economics and management department, said, "The KOSPI surpassed the 4,000 mark on October 27 last year, and the 5,000 mark on January 22 of this year. It appears that sales of domestic stock books have increased rapidly amidst this trend." He added, "Sales rapidly increased from November, right after the KOSPI surpassed the 4,000 mark, and continued to rise steadily for three months until January, when the KOSPI surpassed the 5,000 mark. “It continues,” he analyzed. Analyzing the distribution of buyers of 'investment and finance books' over the past three months, 'men in their 40s' ranked first among all age groups at 16.6%, and women in their 40s ranked second at 16.4% (combined 33.0%). ‘Men in their 50s’ ranked 3rd and 4th with 16.3%, and ‘women in their 50s’ accounted for 15.2% (combined 31.5%). Men and women in their 20s were 2.7% and 1.9% (combined 4.6%), the only adults with a single-digit distribution, and the purchase of investment and financial technology books was low, clearly revealing the investment imbalance between generations. Men in their 30s were 10.12%, women in their 30s were 8.5% (total 18.7%), men in their 60s or older were 8.3%, and women in their 60s or older were 3.7% (total 12.0%). In addition, the proportion of purchases by men and women in their teens and younger was 0.1% each, accounting for 0.2% of the total. Although the proportion itself is small, it is a significant number considering that they are still minors. This is interpreted as the result of children in their 40s and 50s, who are the largest purchasers of investment and finance books, being influenced by their parents who are highly interested in investing. It seems that they realized early on that investment and finance are not a reality that they face after adulthood, but a task that must be learned quickly from adolescence. Among the investment and finance books sold during this period, the best-selling book was 'Park Gom-hee's Pension Wealth Class' (Influential) by author Park Gom-hee. Second place was ‘Stock Investment for Progress’ (21st Century Books) by Lee Kwang-soo, and third place was ‘All About ETF Investment’ (Maekyung Publishing) by author Moon Il-ho. In addition, 'Minimum Economic Study to Survive in the Capitalist Era' (Heist) by Baek Eok-nam (Kim Wook-hyeon) and 'Large-Cap Trend Following Investment Rules' by Lee Jong-ho (Jeonhwang) followed in 4th and 5th place. Ta-chan's 'Rich Dad's Immutable Law of Investment' (Big Forest) ranked 6th, while Morgan Hausel's 'Money Equation' (Western Germany) and 'The Psychology of Money' (Influence) ranked 7th and 8th.