It is difficult to classify. In fact, it creates divide.
We can look from another point. Introduction to scalable tax
from 1% to 20%
Below is an example:
Items below $50 are taxed 1%
Items above $50
to $200 are taxed 3%
Items above $200 to $1000 are
taxed 7%
Items above $1000 to $5000 are taxed
15%
Items above $5000 are taxed 20%
While most people cannot avoid the taxations, it is a rather
interesting implementation.
So on and so forth. However, this poses a challenge for most
standard POS systems and the tax collecting systems.

sound good. but i guess they will, like what you said, give all
sorts of excuse on the implementation. when collecting taxes, they
can crack their heads to think of all the first in this world
methods like electronic road pricing & COE and if you
remember when gst is first introduced, they go through the
trouble to mint lots of 1 cent & 5 cent coins.
but when it is to collect less tax, the same fervour
is suddenly missing.