Finally we're speaking
Risk: Amount that you are willing to loose per commerce, say I'm willing to loose 5% of equity/trade and also my weekly goal is 15 percent of equity (using the popular 1:3 Risk-Reward ratio).
Now comes handy appliion:
I have $100, on each trade I am ready to loose $5, now I could loose it onto a varying number of pips (determined by my selection of lot-size), generally the lower the lot-size the tougher it would be to loose the $5 and the tougher it is to create the $15, lower lot-size would demand greater pips (most likely also a higher number of trades to become taken/week) my experience in trading states that the greater the number of trades that the greater the frequency of losses.
Really risk is simply really defined when an S.L is set, before that it's 100% of your equity regardless of lot-size. So I have to decide the maximum S.L I can have on any given trade, which is determined by lot-size, not forgetting the number of trades (what modulates these decisions?)
As you can see there's not any clear definition on lot-size, S.L or not any. Of trades to be chosen utilizing this suggestion. My egy helps me define no. Of trades (to some given amount ) and also lot-size. I think S.L always varies, as does T.P.
I might be wrong with my assumptions, this really is your suggestion, you could shed more light on the process (it could be useful to other viewers).