Why did Byungchang Park buy stocks on the day a circuit breaker tripped? | MP Partners CEO Byungchang Park [Weekend Interview]
An independent exercise, not a statement by the video creator or verification of every claim in the video.
Compare losses before and after adding exposure under the same shock
Assume an account worth 100 has 40 in one sector and the rest in cash. Spending another 20 in cash raises sector exposure to 60, so a subsequent 20% decline in the sector increases the account loss from 8 before adding to 12 after adding. Even if the long-term holdings and the rebound trade have different labels, their losses add up when they share the same sector exposure.
Check for yourself
- How much sector exposure do you have after combining overlapping direct holdings and ETFs?
- What would make you cut the added position if a rebound never comes, and what would invalidate the long-term thesis?
Limits of application
The exercise assumes cash holds its value and all sector holdings move by the same percentage. It excludes fees, taxes, currency movements and borrowing.
- What to look for
- Follow how Park forms a hypothesis about the selloff and why he separates long-term holdings from an extra position aimed at a rebound.
- Why it matters
- Practice evaluating separately whether prices look cheaper, whether the investment thesis still holds, and whether you could absorb another drop.
Timeline
10 segmentsPark says he did not see the selloff as a systemic crisis and deployed the cash he had set aside for investing under a prior plan. He distinguishes holdings intended for the long term from an added position he would trim on a rebound. The depth of a drawdown alone cannot establish undervaluation, and his view on the timing of a rebound is conditional.