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In this situation, any exchange is yet to happen. But, we have found a coincidence where person A (Ramu) wants to sell shoes and needs rice and person B (farmer) who in turn wants to sell rice and needs shoes. This situation is defined as Double Coincidence of Wants (Option A)
 RAMU  → Shoes → Farmer
 RAMU ← Rice ← Farmer

Sustainable development is the development of the society to meet the human development goals, and without compromising on the need to balance the ecosystem and the environment.

It is essential to maintain and practice sustainable development because society is driven by needs and harming the balance of the environment and the ecosystem to fulfil their needs. For example, we are dependent on natural resources like fossil fuels to meet our fuel needs. 

It is going to be extinguished in a couple of years and will take millions of years to restore. One main implication of following the unsustainable development is th climatic change global warming.

Having said that, sustainable development is not just about the environment. It also focuses on the human well being and ensuring a strong, healthy society. It simultaneously focuses on both the environment and society. The changes that we adhere to now will impact in the future. For example, Take a walk or cycle to the nearby shops or supermarkets, instead of taking your bike. This will save you money, fuel and also increases your body movement.

To practice sustainable development, it is essential to make the right decisions, as it will affect society. For example, depending on the imports for their food supply, instead of growing it, UK runs short on food supply.

Hidden unemployment or disguised unemployment is a kind of unemployment where some people seem to be employed but are not. This usually occurs when there is over-employment in a particular sector. This basically means that on paper you can show employment but in reality, too many have been hired to do a job that can be done by fewer people.

When people can’t find jobs that employ their skills or education to full capacity, they still have bills to pay, so they settle for lesser responsibilities, known as “underemployment.” 

For example, in the rural areas per agricultural sector, where ten members of a farmer family are employed on small farm plots when five are enough. Those extra 5 members are unemployed rather than being employed.

Another example is if you have one cow, you ideally need one person to milk it. If you hire 10 people to milk one cow, you just created disguised unemployment.

Double coincidence of wants occurs when two individuals swap their goods, in exchange for one another. This is also referred to as the 'perfect barter exchange'. In such cases, both the individuals are happy to exchange their good or commodities. 

For example, if two individuals want to exchange and place on a loaf of bread and a bag of apples, then this is known as double coincidence of wants. This results in an efficient transaction between the two individuals. 

These types of transactions were practised during the barter economy system (cashless system), where two people had to swap each other's goods or commodities in exchange for one another. This type of system had its own limitations and drawbacks. One of the main limitations was that two people should have goods that they're willing to exchange. 

For example, a loaf of bread cannot be exchanged for a bicycle because it would be no good. Then, there is no double coincidence of wants. However, if you can swap a loaf of bread for a bag of apples, then it satisfies the double coincidence of wants.