Suppose that the market is incomplete, so that there exist elements of \(\mathscr{K}^{+}\)that are not contained in \(\bigcup_{x \in \mathbb{R}_{+}} \mathscr{C}_{0}^{+}(x)\). Show that the arbitrage free price of an attainable consumption process \(c \in \bigcup_{x \in \mathbb{R}_{+}} \mathscr{C}_{0}^{+}(x)\) is uniquely defined, regardless of the specific risk neutral probability measure \(\mathbb{P}^{*}\) chosen.