梱搏式服務
"A tying arrangement is defined as the conditioning of sale
of one product on the buyer's purchase of another product."
In the case of bus spam, the first product is the the bus ride
and the second is the forced viewing of broadcast.
"... thus enabling the bus company having a monopoly in one
market (bus operation, in so far as that particular route is concerned)
to obtain a monopoly in a second market (broadcast on buses)."
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