What are the requirements to get those free trades?
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There should be no requirement. There are a number of places now that allow you to buy equities (stocks) and maybe ETF's (Exchange Traded Funds) with zero commissions.
Schwab evidently does, TD-Ameritrade does.... I've not paid attention to know who else does but the trend is certainly heading there for those who are not doing it.
Side comment.... about buying when stocks are down.
Pretend for a moment, you are an avid hunter (not you per se', but anyone reading). Tomorrow is first day of open season, you have prepared and are ready to go when you realize, I don't have any ammo!!!
So you go to the store to buy a box of ammo that is $20 per box (I don't know the price of ammo so roll with that number).
You walk into the store to buy a box when you see your exact ammo is on an endcap....it's on sale for $5.00/box....
"What might you do??" (answer should be "I'd LOAD UP on it!!")
Perfect, so you are busy loading your cart when you hear a voice behind you....the voice (me) says "Hey, great, there's the ammo I need and been looking for.... oh, wait....WHAT??? It's on SALE???......nope!!! I'm not going to buy any on sale, I think I'll wait until the sale goes OFF before I buy my ammo"
Your there (loading your cart still) thinking "what is up with this dude???"
Then, you hear me say "As a matter of fact, I think I have some of this ammo in my safe.....I paid $20 for it and not it's on sale for $5.00....I think I'm going to go home and throw it all away!!!"
About now, you are hopefully thinking that someone needs to take me behind the woodshed....
Full Disclosure: I've been in the investment business for over 30 years (worked at Ameritrade prior to getting downsized). Anyway, if you look over my last 30 years and exchange the word "Ammo" for "Stocks".....I have had that exact conversation with people.
I'll let you decide the merit of that point of view.