The Tourist “Industry” is mainly an industry of Unproductive Labor. That is to say that the industry and its workers are paid on Revenue and not on Capital. To go further, Capital is being generated in Tourism; some Capital in the World is reallocated here as to keep it alive and the Tourist “Industry” quickly spends it to stay afloat.
The Tourist “Industry” however relies on productive labor of other industries like Construction and Agriculture. These reproduces Capital that helps feed back into the market so it can even reproduce itself. However, depending upon where the Tourist “Industry” contacts to get their supplies, that place will have their Capital reproduced. São Tomé e Principe’s Industry are screwed over as the Tourist “Industry” doesn’t support them nor allocate the Capital to these industries as to generate local commodities to their satisfaction.
That’s why “poverty and wealth” can exist on this level, because they don’t intermix they discriminate against each other so highly there that their existences seem independent of the other. But rather that they are closely dependent and correlative of each other for them to exist. And these islands showcase how the Global Rich benefits off the Global Poor - the poor’s downtrodden existence gives the rich’s existence an easier time to float by unharmed.