Capstone project ideas for Math Undergrad trying to make it into IB

I already have a degree in economics but am completing my last semester as a math major and have received interviews at boutique banks but my lack of experience is holding me back. Would any of you have ideas as to what I should do as a capstone project in mathematics that would result in an impressive interview quip and demonstrate me bringing something to the table at an IB? (Please note that the capstone project is relatively open ended as long as some mathematical analysis is used)

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