The City of Phoenix Finance Office shall create a sub-portfolio for all green and sustainability bond proceeds to be easily tracked and reported. See "TAX MATTERS Tax Exempt Bonds .A yield curve plots the interest rates of bonds that have equal credit quality but different maturity dates. The three types are normal, inverted, and flat. Bond yields and bond prices move in opposite directions, impacting the market value of other investments. And provide feedback to bolster market demand. Improved market demand can lower borrowing costs. Please fill out a Speaker Request form prior to addressing the Council.