Answer:
It would be important for the island with only pineapples to trade to get the other resources it needs to survive. Not to forget that they would still be a consumer economy and would need things like phones, clothes, and potatoes, or even the water, and the fertilizer.
Furthermore, it would be important for the Island to trade with "Smartphones, potatoes, and clothes" to get the other needed resources. For example, if all they have is three things they would need the raw resources needed to make these clothes with cotton (example) or the smartphones and their metal frames.
Explanation:
Some of the places we see today such as Taiwan imports Coal, Oil, and Natural gas for their energy economy, but they export electronics, base metals, plastics & rubber, machinery.
