Define the marginal rate of substitution.Using this concept,explain why market basket A is not utility maximizing while market basket B is utility maximizing. 
Definitions:
Sale of Goods
A transaction between a buyer and a seller in which ownership of physical products is transferred in exchange for money or other compensation.
Writing Requirement
A legal principle that certain types of contracts must be in writing to be enforceable.
Writing Requirement
A legal standard mandating that certain contracts or agreements must be in written form to be considered valid, often to ensure clarity and evidence of the terms.
Merchants
Business people or companies engaged in retail or wholesale trade of goods or services.
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