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A meme is an idea, behavior, or style that spreads by means of imitation from person to person within a culture and often carries symbolic meaning representing a particular phenomenon or theme. A meme acts as a unit for carrying cultural ideas, symbols, or practices, that can be transmitted from one mind to another through writing, speech, gestures, rituals, or other imitable phenomena with a mimicked theme. Supporters of the concept regard memes as cultural analogues to genes in that they self-replicate, mutate, and respond to selective pressure. In popular language, a meme may refer to an internet meme, typically an image, that is remixed, copied, and circulated in a shared cultural experience online.

EXAMPLE Investing Meme:

“Sell in May and Go Away” is an investment strategy for stocks based on a theory (sometimes known as the Halloween indicator) that the period from November to April inclusive has significantly stronger stock market growth on average than the other months. In such strategies, stock holdings are sold or minimized at about the start of May and the proceeds held in cash; stocks are bought again in the autumn. So, “Sell in May” can be characterized as the memetic belief that it is better to avoid holding stock during the summer period.

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The Wall Street adage — ‘Sell Rosh Hashana; buy Yom Kippur’ — focuses on the market’s performance between these two Jewish holidays. This seasonal stock-market trading pattern is upon us — and worth observing.

Rosh Hashanah is the Jewish New Year while Yom Kippur is the Day of Atonement. So, according to Mark Hulbert, it might seem arbitrary to make stock-investment decisions by blending religious observance with financial strategy, but there’s one old trading folklore commonly or meme mentioned during this time of year: “Sell Rosh Hashanah, buy Yom Kippur.”

This Wall Street adage suggests that U.S. stocks tend to fall over the 10 days the Jewish High Holidays are observed, so investors would be better off selling beforehand and buying afterward. But some market analysts believe investors should be wary of this seasonal trading pattern this year.

Historically, the “sell Rosh Hashanah, buy Yom Kippur” strategy is closely tied to the stock market’s tendency to under perform in September, with investors often looking to “minimize exposure” during this period, according to Yehuda Leibler, chief strategy and technology officer at ARX Advisory.

“SELL IN MAY”: https://medicalexecutivepost.com/2025/05/09/sell-in-may-maybe-not/

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