In the "win-lose" games of active trading, your "edge" comes from:
- Buying from someone too cheap
- Selling to someone too expensive
At least on average.
To do this, you need to know who you are playing against.
🧵on "edge", where to find it, and how you can compete 👇
1/n
If you are a market maker, it is relatively clear to understand who you are trading against.
If you're a positional trader, it is perhaps less clear.
On a trivial level, you're probably trading with a market maker.
2/n
But understand that "the market line" is set by the supply/demand pressures of other aggressive traders.
- End users (wealth mgmt, retail)
- Aggressive prop traders doing short term risky arbs
- Informed positional traders with pricing models + (maybe) info advantages
3/n
It is easy to understand why "end users" would be prepared to trade at inopportune prices.
- perhaps they don't know any better.
- perhaps they are operating under *constraints* (they HAVE to sell/rebalance even though they don't WANT to)
4/n
- perhaps they need to get an investment committee together before they can make a trading decision
- perhaps they are * incentivized* to do things that don't maximize their expected returns (window-dressing, return chasing, defensive posnig around the reporting cycle)
5/n
In an uncompetitive trading environment, it would be easy for you to get an edge in the markets by understanding the above.
You could get paid for selling to these traders when they were FORCED to buy, due to their constraints.
6/n
You could get paid for buying trash from fund managers that were interested in "tidying the book" for window-dressing around exposure reporting dates.
And also from selling them the "respectable-looking" stuff they want to rotate into.
7/n
You could get paid for fading short-term supply/demand imbalances caused by impatient noise traders.
You get the idea...
It's clear that in an uncompetitive market, we could make good money trading.
There's plenty of uninformed money out there!
8/n
HOWEVER... (big however)... we don't trade in an uncompetitive market!
We trade in a highly competitive one!
There are highly sophisticated, fast, trading firms like Citadel competing to trade the short-term inefficiencies.
9/n
And there are sophisticated analysts running pricing models at hedge funds and banks making it difficult to get an edge on pricing/valuation with public knowledge.
The intense competition means that prices tend to be extremely efficient.
10/n
I don't necessarily mean that everything trades at the "right" price (if we could know such a thing)
I mean that it's hard to make money trading both in the short term and the long term.
The aggressive competition for P&L is what *causes* this:
These "elevator pitches" are simple statements of:
WHAT would cause the inefficiency
WHY it wouldn't be fully "gobbled up" by other aggressive traders who are faster or better informed
HOW you might harness it, on average.
19/n
Sometimes, if this is compelling enough, this is enough to start designing a strategy to exploit the effect.
But if you have enough data, you'll want to look for evidence in the past data that you could have exploited the effect.
Simple data analysis is your friend.
20/n
You start thinking about HOW you're going to trade an effect, once you have:
- An "elevator pitch" for why YOU can exploit the effect
- Significant evidence of it in the past data.
Then you want the simplest trading rules to exploit the effect.
Tips for doing financial analysis with OHLC bar data.
Many of you doing quanty analysis with OHLC bar data.
Here's some boring but crucial stuff you need to understand if you're doing that. 👇👇👇
1/n
An OHLC bar represents a summary of trades that happened in a certain period.
Open -the price of the first trade in the period
High - the highest price traded in the period
Low - the lowest price traded in the period
Close - the price of the final trade in the period
2/n
For daily stock data, the Close price will be the price arrived at in the closing auction.
This is set by balancing the supply and demand of MOO (market on close) and LOO (limit on close) orders to maximize the amount of stock traded.
3/n
It's easy to lose money trading if you:
1. Trade too much (paying fees + impact on each txn)
2. Size positions too big (high vol hurts compounding ability + gets u rekt)
3. Shorting positive drift/risk premia
It's hard to lose money consistently if you avoid these things.
However clueless you are, you get to trade at market prices.
Imagine we can know that an asset has a fair value of $100.
You might think it's worth $150.
But if it's quoted $99 / $101, you can buy now at $101.
You were totally wrong but you still bought close to fair value.
The same mechanisms that make it hard to get an edge also make it hard for you to trade at really bad prices.
In a simple model, you might say that prices are set by:
- (risky) arbitrage and relative value in the short term
- pricing/valuation models in the long term