The following diagram shows one indifference curve representing the preferences for goods X and Y for one consumer. 
What is the marginal rate of substitution between points A and B?
Definitions:
Disinfectants
Chemical agents used to eliminate or reduce harmful pathogens from surfaces, objects, or environments, contributing to infection control.
Hydrogen
A colorless, odorless, highly flammable gas, constituting the most abundant element in the universe and used in various industrial processes.
Oxygen
Oxygen is a chemical element with symbol O, essential for most life forms on Earth as part of the process of respiration and energy production within cells.
Capacity Constraint
Limitations on the resources available for production or service provision, impacting the maximum output achievable.
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