I am new to Amibroker and I have been using Howard's which I find to be 
excellent, as a guide to learing AB. 

I find the statement that all trading systems stop working eventually to be too 
vague. First "stop working" is a relative term and would have a different 
meaning for each of us. Also I think inefficiencies can come and go in cycles 
based on the popularity of a particular type of trading. Once an inefficiency 
has been traded away due to over-popularity, it probably will go out of fashion 
and then become an inefficiency again some time in the future. All this depends 
on the specifics of what we mean by "stop working" and "a system".

Rich



--- In [email protected], "samu_trading" <samu_trad...@...> wrote:
>
> All,
> 
> In his really good book Quantitative Trading Systems, Howard states that all 
> trading systems will stop working forever at some point (because the 
> inefficiency in the market they exploit will be killed by everybody jumping 
> on board).
> 
> On the other hand you have momentum / ROC based systems working forever now, 
> same for trend following MA crossover systems like The one propagated by 
> Mebane Faber. Momentum and MA rossover trendfollowing does seem to work 
> "forever".
> 
> Any comments from the gurus here?
> 
> Thanks, Samantha
>


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