Amos, thanks.
From what I have seen / heard, the big brand manufacturers (like Pelco, Axis, Panasonic, Sony, etc.) typically try to stay close to each other's pricing.
For example, if Axis was to suddenly drop their prices 20%, then Pelco, Panasonic, Sony, etc. would seriously consider matching.
On the other hand, if an integrator or user says "Hey Pelco/Axis/Panasonic/Sony, I see Dahua/Hikvision/ACTi/Vivotek has the same exact specs for half the price", they'll most likely blow it off.
As one Pelco rep revealed in our manufacturer sales pitch review, "Pelco emphasized being from California / the US and that Hikvision was 'not in the same field'."