very competitive doesn't mean in high demand , even though they correlate Due to high demand, advance d payment is needed. advance I'd say: Due to high demand, an advance payment is required/necessary/needed.
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PeaceblinkfriendIf at the bottom of a brochure advertising a seminar read 'Due to high demand, an advance payment is needed', how would you describe the seminar? Is it natural to say 'the seminar is in high demand'? YesHi PBF