I noticed that and bought some SWVXX recently That's a really nice yield for a money market fund. At Schwab are they treating the amount of cash in the money market as buying power. It looks like at A-Trade, they are not. That's in a cash account at least, not a margin account.
MM fund SWVXX - are you still trading these (every 7 days) at tdameritrade? Aren't you concerned with all the "non-insured" boilerplate verbage on the website?
I've gone to 90%+ cash. I intend to still actively trade but only very short term as the likelihood of a temporary all-out collapse is just too great.