If you were trying to describe the effect on the yield curve that certain investors have a definite preference for the maturity of the bonds that they invest in,then you would be referring to

Question

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The preferred habitat theory states that investors have a preferred maturity range for the bonds they invest in, but they may be willing to invest outside of that range if they are compensated for it. This can have an effect on the yield curve as demand for certain maturities increases or decreases.

If You Were Trying to Describe the Effect on the Yield