[rsj_hn]

You are assuming that there is no such thing as a "rate" of growth. Things are either growing or not. Thus if the market is "growing" at 6%, then it's OK for a member of the market to double in size every year because both are "growing" and aren't "fixed".

Numbers matter here, you cannot have one member of the market grow at a faster rate than the market forever.

Not sure what else I can do to explain this more clearly. Try using a spreadsheet or calculator to work out some examples for yourself.