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o Strong period (November~April): Year-end dividends and consumption season, anticipation for the new year (January effect), announcement of first quarter earnings (April), etc., generally lead to higher returns and a higher probability of increase.
o Weak period (May~October): Decrease in trading volume during summer vacation season and uncertainty about third quarter earnings, etc. tend to result in the lowest performance throughout the year in August, September, and October.

I created this with ChatGPT because there is no recent data.
The pattern is very similar to the reference materials below.
So, let's buy now??? ㅎㅎ
Reference) KOSPI Monthly Average Return Rate: 1980~2024

▶ Original source: https://biz.heraldcorp.com/article/10603019