What are computers good at?
- speed
- identifying simple, persistent, patterns
- sticking to a plan
- getting their position scaling correct
- managing large portfolios
What are humans good at?
- processing complex, novel, information
- interpreting non quantifiable information
- genuine forecasting (rather than extrapolating the past, or assuming it will repeat) eg Paulson's CDS short, Soros
Which trading arenas are computers likely to be better at?
- HFT
- scalping (sure humans can do this, but you'd die of boredom, wouldn't you?)
- Systematic technical analysis
- equity neutral - where the portfolio is large but requires only quantifiable factors
- Stat arb
- passive index tracking, and 'smart' beta
- "vanilla" arbitrage or near arbitrage eg index vs constituents, on the run vs off the run treasuries
- any other strategy that boils down to smart or alternative beta, where a simple set of rules does the trick
Which trading arenas are humans likely to be better at?
- fundamental economic analysis, eg global macro type bets (Soros and Paulson again)
- subjective technical analysis (which, frankly, I am personally very skeptical of)
- weird, one-off, pure or near pure arbitrage trades (eg cash-CDS in 2009, French Gold linked bond in bonfire of the vanities...)
- special situations / event driven, eg merger arbitrage
- 'deep dive' stock analysis, on the long or short side, where you go right into the nitty gritty of the business
- activist investing (computers can't harass the board into doing what you want)
- anything where every trade is different and or relies on analysing a lot of non quantifiable information
(Note that the human edge in the later arena will be reduced or depleted if they don't have the discipline and the knowledge to set up their position sizing and management correctly and stick to it)
Did I miss anything?
At the risk of repeating myself from another thread:
- The very best human traders will always be better at trading than computers
- Most of us, including me, are not amongst the very best human traders.
GAT