The basic assumptions regarding hawkers seem to be:

1) Consumers want to use the services provided by hawkers

2) The right of hawkers to provide services must not compromise any
other rights of citizens like encroachment free roads, and footpaths,
neither must it cause any further problems like traffic, noise
pollution, hygiene issues, etc.

3) Hence regulation of hawking as an activity is required: what is
sold, where and how it is hold, and by whom (how many numbers) can
sell, etc.

4) The concept of hawking and non-hawking zones has been devised as a
means of regulation of hawkers.

5) If the criteria, specifications, etc of hawking and non-hawking
zones are found to be satisfactory / acceptable (by whom? - hawkers
are not really a stake-holder here, since their basic right to hawk is
already fulfilled -), then further, the BMC / Police must enforce the
same, and citizens to assist in doing so.

Any other assumptions?
T