John,
You need to send away this student with the following task: prove it!
Get the student to build a series of simple examples with numbers on them
that will either prove or disprove his point.
What I think is happening is that this student has conceptualised from
empty supply schedules: just a graph with no quantity values and no price
values and then decided that if the supply curve passes through the Y axis,
then 'x' is the case ...
Student should then report back to your group and be prepared to take some
flak and/or heaps of praise!
Duncan Williamson
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