What happens with my AAA-rated bond portfolio in the next 30 years?

One question a client asked was how rating migrations would effect their portfolio in the long term, and how to adjust the asset allocation to keep a stable average rating. As a small demo and proof of concept, I wrote a small shiny app. It allows you to adjust the portfolio weights based on the rating categories, the duration of the portfolio, and  the growth rate of the portfolio.

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