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I passed on the ED account in favor of Vanguard's Federal MM (tax savings make it better in my case than Prime MM). ED hasn't boosted their rate in a while, but VG boosts theirs by 0.01% every day it seems (along with rising rates). ED is FDIC insured, whereas VG MM's aren't, but I'm sure VG will do everything in their power to keep the value constant at $1.00 for their MM funds.
I look at it like this: if I have $10,000 in a MM, I'll forgo $30 per year by picking VG over ED. But the VG account has tax benefits that reduce that amount. I constantly make automatic transfers to buy index funds by DCA'ing twice a month. I use the VG money market to fund these trades. If I had ED, I'd have to constantly go their, transfer money, etc. A lot of hassle for $30/year. Now, if you add enough zeros to your balance, it may be worth while to "chase yield" and pick ED. Not for me though.
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