This is what it means. I think staged is a more usual term than laddered which have never come across in business

context is lacking, but that is what echelonnées suggests..

laddered meaning that the maturities are laddered... that is, successive

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Note added at 54 mins (2008-12-09 20:26:44 GMT)
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I would use "staggered" rather than "laddered" to express the stage-by-stage nature of the investments.