Ethane cracker versus naphtha cracker
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The prompt
Compare two fictional ethylene producers. A Gulf producer uses ethane: 1.3 tonnes of ethane at USD 200 per tonne make 1 tonne of ethylene, plus USD 140 of other cash costs. A European producer uses naphtha: its net feedstock cost is USD 650 per tonne of ethylene after credits for the co-products it also sells, plus USD 150 of other cash costs. Ethylene sells for USD 950 per tonne. What is each producer's cash margin per tonne?
Practice with a partner
1. Send the interviewer link to a friend. They read the case aloud and hold the answers.
2. You open the candidate view: you see only the prompt, a timer and a notes box.
3. Speak the case out loud. Your partner shares data when you ask, then scores you with the rubric.
Interviewer view
For the person running the case
Candidate view
For the person answering the case
Clarifying questions, with the interviewer's answers
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