Oh yeah I see now, thanks. I was misinterpreting the first column.
Obviously it's impossible to glean motivations from a table, but it's telling to me that among the general population the majority of workers work full time, whereas among the poor it's the opposite, with most working part time for the entire year.
These people would probably be called the 'working poor' in my country; they're trying to work, but unfavourable economic and employment conditions make it difficult to maintain stable/consistent/quality employment. But in comparison to other developed countries, the proportion of workers (in that table) for a poor demographic is relatively high. Which would also signal to me that not only is the demographic not choosing NOT to work, but that they're choosing to work in higher numbers than in other countries despite their poverty (or maybe because of it).
https://upload.wikimedia.org/wikipedia/en/7/74/Pov_crossnatl...
I still maintain that people don't choose not to work en-masse for extended periods, evidenced by the fact that the US has had full employment for many periods.