In short, everything in Taiwan is about 4-6 times more expensive (with the exception of electronics and airfare since these products and services have costs that are high regardless of the economic performance of the country)byoker said:
Taiwan's GDP per capita, computed by Purchasing Power Parity (PPP) is indeed 4.5 times more than China's (26700 vs 6200 USD).
However, Taiwan's GDP per capita, computed by nominal exchange rate is actually 10.5 times more than China's (13450 vs 1300 USD).
The above comparisons shows that Taiwanese absolute income is 10.5 times as Chinese, but since consumer prices are much more expensive in Taiwan, Taiwanese only enjoy 4.5 times more income than Chinese.
Note that Hong Kong is also pretty much similar to Taiwan.