DEC-1982
Full time employment: Posting here.
That doesn't make sense because you don't know whether stock prices will be down or up in the future. And the general trend over time is up, not down, over time. The instructor is off in both the buying and selling scenario. In 25 of the last 30 years the stock market finished higher at the end of the year than when it started. That favors buying early while it's low, and spreading out selling over the year.
What one needs to do is run though a couple of hundred scenarios, doing withdrawals at the beginning of the year, and the compare them to another couple of hundred scenarios doing monthly withdrawals, and see which one comes out better. I haven't done that, and I look forward to somebody doing that and posting their results.
I'll investigate a bit and see if this has already been done in the past.