For example: "I used to be a well paid teacher until I started being a tougher grader. When my students' grades went down, so did my salary." While this sounds like a logical explanation, not all factors are taken into account. For example, the teacher's school could have been subject to budget cuts, or maybe the teacher was overpaid at first and now his salary corrects his true worth.
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For example: "I used to be a well paid teacher until I started being a tougher grader. When my students' grades went down, so did my salary. Therefore, I must have been paid based on my students' grades." While this sounds like a logical explanation, not all factors are taken into account. For example, the teacher's school could have been subject to budget cuts, or maybe the teacher was overpaid at first and now his salary corrects his true worth.