Just to add.... While the pace of technology is gaining greater acceleration, semantics have been unable to keep pace. From the mathematical, as well as jargon, point of view an 'algo' and a 'mechanical system' can be said to be cut from the same cloth. Both are based (mostly, or in part) on an algorithm. However from the employment point of view of both in the trading arena, there can be said to be a fine differentiating line. To briefly summarize in layman terms - a mechanical method is quite literally the 'mechanization' of a
setup to generate actionable (buy, sell, short etc) signals. Whereas an 'algo' is the mechanical vehicle employed to handle
order execution (time/ quantity slicing, high frequency arbitration order handling etc) and
market making functions. Interestingly, nowadays 'algos' are also employed as a kind of 'riot squad'
for order stuffing and order pulling in thinly traded/ illiquid instruments
That having been said, pure algo ops are beyond the realm of the retail trader. Substantial investment and infrastructure is a prerequisite along with co-location to achieve a definable edge. Mechanical systems, on the other hand, can be implemented by retail traders. However, the art of creating one with a definable edge is an altogether separate topic
Very interesting indeed!!! How much capital deployed, and the quantum of time that was required for training? Would request you to share the outcome and the lessons learnt (of course, only if your friend has no objection to the same)
As it stands, even with a mechanical method an average retail trader with modest means may not be able to trade beyond a particular number of instruments. Am assuming that an average retail trader uses a single rig with a single monitor and uses a TA/ charting platform (for e.g amibroker) for trade generation. In this case, the trade generation will essentially require the chart of the instrument in question to be 'active'. There will be a usable upper limit (depends on your rig config, background apps etc) of 'active tabs' beyond which your platform will eventually grind down to a veritable crawl. Hence the employment of a mechanical system may not be a panacea for all ills
.
P.S - Since have been there and done that, let me just advise you to take it on faith that discretionary trading has far greater edge.
Caveat - One has to first develop the finer discretion
Regards,