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Marginal utility of consumption

From CFAI book Pg 385

[question removed by moderator]

Why would marginal utility of consumption rise with purchase?


"Using Wiley for my CFA journey was by far the best option… I was able to pass on my first attempt.”– Moe E., Canada

I think you just misread the sentence, because it does not. 

It says that you spend more on bonds and have therefore less of your budget left for consumption, i.e. you consume less. The marginal utility on consumption therefore increases (because you are consuming less). Likewise  the marginal utility of an additional bond decreases (because you already own more).