This one's about margin accounts, i.e. how much in the red for margin are you after adjusting for...stuff.
Your max borrow under Reg T is 50 percent, so if you have 100k in your brokerage account, which has been set up as a margin account, you can borrow up to 50k, but that's after adjustments.
So like...what adjustments? Well, things like interest charges and sometimes liquidity discounts, i.e. in thinly traded shares, if you wanted to just get out, you can't without dropping the price a ton.
So more adjustments often then come in from the broker imposing their own set of 'safety rails' on top of the Reg T margin structure.
Related or Semi-related Video
Finance: What does it mean to rebalance ...1 Views
finance a la shmoop what does it mean to rebalance an account alright people
here's your account pretty broad-based equity portfolio and pretty pie chart -
they're nice going there editor's 17% bank and insurance 14%
telecommunications 9% consumer comestibles 6% drugs legal ones 11%
chemicals in commodities 8% transport and whoa 35% tech well just five years
ago Tech was only 15 percent of your portfolio and it performs better than
double the returns of the rest of the market in that time period so Wow what
time is it need a high tech watch to answer no its rebalancing time why well
because you want to just compound at market rates and yes Tech has been
amazing and wonderful and loving but Tech can get crushed in bad times as
well and the huge 37% exposure to it is well keeping you up at night and it's
see it's gotten up 2% there since we started this video it's just too much [girl waking up in bed at night]
risk attributed to one relatively narrow area of the investing economy even [pie with a risk tag on it]
though it touches everything well you're thinking about making tech more
representative of a balanced broad S&P 500 index fund where in that fund it [S&P 500 document]
represents on only say 11 or 12 percent so you sell some Apple you sell some
Google you sell some Amazon Facebook Netflix Microsoft and you buy a [company logos]
smattering of high dividend high yielding defensive stocks like Chevron [military plane flying]
for Dow Chemical and Bank of America it's kind of defensive in practice [company logos]
portfolio managers rebalance their portfolios all the time so they
represent the promise they made to investors when they raise the money in [scale with tech out-weighted by diverse products]
the first place to be a fully diversified fund taking only market risk
in the process and if they still need to do any rebalancing beyond that and well [people doing yoga in park]
then they just enroll in a hot yoga class
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Reg T, or Regulation T, is a federal regulation that covers the form and manner in which brokers, or brokerages, can extend credit to customers.