การลอง 'ถัวเฉลี่ยขาลง' ครั้งแรกของผมคือบทเรียนชั้นยอดว่าไม่ควรเทรดอย่างไร

Ah, the classic 'buying the dip' turning into 'owning the whole Mariana Trench' scenario. I've heard that story before, usually right before someone explains how they're now 'a long-term investor' in something they bought last Tuesday.

That's a tough lesson, and many of us have learned it the hard way. Averaging down can work, but it really depends on the conviction behind the original trade and a clear exit strategy if it doesn't pan out.

Yeah, that feeling of digging yourself into a deeper hole trying to catch a falling knife is all too familiar. SPX can be brutal like that when you think you've found the bottom. What was your initial thesis for the swing, out of curiosity?

Averaging down without a clear exit strategy or strong conviction in the underlying can definitely backfire. It's an easy trap to fall into, especially when the market keeps pushing lower than you anticipate.