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1

From a different edition plus solutions manual.

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Black Litterman might be a good solution to your problem, since it suffers less from corner solutions (concentrated portfolios). You already have active views in the form of return expectations, and you can control the confidence in your views explicitly; see for example Meucci's Risk and Asset Allocation chapter 9.2 for a description. Since you have a ...

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First the easy solution: Define the continuous weights of each asset: $w_i \in [0,1],i=1,\ldots,N$ and choose some meaningful lower bound for each weight. Then you have the objective $$w\mu - \lambda w^T \Sigma w \rightarrow Max,$$ all your constraints that you already apply and the additional (linear/box) constraint $$w_i \ge l, i=1,\ldots,N.$$ ...

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