MSBs, however, the scarcity of government bonds makes it hard for the central bank to engage in open-market bond dealings to control the money supply.

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If the home you wish to buy has an implied cap rate that is equal to or higher than the return you think you can safely garner in stocks or bonds, it probably makes sense to go ahead and buy.

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However, it makes sense when you consider shorter term bonds are less risky than longer term bonds.

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Generally, it makes sense to own income-generating bonds in tax-deferred accounts.

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So it makes sense to be biased towards equities, bonds, commodities, houses and wine instead of cash.

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"From a financial point of view, it makes sense for banks to buy back their bonds, " said Andre Rodrigues, an analyst at Portugal's Caixa Banco de Investimento.

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And the intimacy of these events makes it easier to form relationships, build bonds and connect with a potential customer that could very well turn out to be a customer for decades.

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That makes it easier for the issuers to sell the bonds at an attractive rate to institutional investors, like pension funds.

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This makes it difficult to ensure a bond ETF encompasses enough liquid bonds to track an index.

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Fiscal discipline makes it easier for the European Central Bank to step in and buy bonds.

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That said, it also makes sense for you to maintain some exposure to defensive investments such as bonds and cash until the curtain of global uncertainty unfolds.

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