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Normal volatility is a little bit different to a large centralized exchange (or in the case of Binance, one of the largest crypto institutions that are still operating) being forced to close operations.
If Binance were to be closed, positions will be cancelled, not liquidated. In an ethically fine event, everyone can withdraw and the exchange will store or sell the excess...maybe, the price won't be drastically effected by this. However, that is a very idealistic view.
It has been reported that Binance have less reserves than exchange balances...this could mean five outcomes:
1. Binance somehow find the difference, buy crypto and allow the balances to be withdrawn.
2. Binance find a way to close without 100% of balances being able to be redeemed. Likely by selling, causing a market catastrophe, buying the difference.
3. Completely liquidating all crypto and paying everyone a share of the proceeds based on their percentage of total exchange balances.
4. Liquidating everything for fiat, strict withdrawal process and buying only when needed to process withdrawals.
5. Everyone gets BNB, all assets migrate to BNB, all reserves injected into BNB.
All seem unlikely, all are possible in the event Binance stop normal operations and need to close. One thing is for sure, it will cause unprecedented waves in the market.
While its fun to imagine such dramatic situations, I think any shutdown would need to be managed carefully and professionally. I prefer your third and fourth scenarios as a crypto-enthusiast who values due process.
First, selling all crypto assets and distributing the money depending on users' portion of overall balances seems fair. Due of its volume, it can cause a major market decline.
To circumvent this, liquidate assets for fiat, institute a tight withdrawal process, and buy only when needed. They assure market stability and user share this way.
Regardless of the outcome, the market would shake. However, it must be handled wisely to ensure user fairness and market stability.