To succeed in building a competitive advantage, a company's strategy must aim at select one:
a. charging a premium price for a superior product or service
b. externally providing buyers with what they perceive as superior value
c. internally performing value chain activities differently than rivals and building resources and capabilities that they cannot readily match
d. becoming the market share leader and having more distinctive competencies than rivals
e. both b and c

David consumes two things: gasoline (g) and bread (b). david's utility function is u(g, b) = 10g^0.25 b^0.75. use the lagrange technique to solve for david's optimal choices of gasoline and bread as a function of the price of gasoline, p_g, the price of bread, p_b, and his income m. with recent decrease in the price of gasoline (maybe due to external shock such as shale gas production) does david increase his consumption of gasoline? for david, how does partial differential g/partial differential p_g depend on his income m? that is, how does david's change in gasoline consumption due to an increase in the price of gasoline depend on his income level? to answer these questions, find the cross-partial derivative, |partial differential^2 g/partial differential m partial differential p_g.