I take the risk of modern-day slavery very seriously. I think it will actually be serfdom, not outright chattel slavery (except in a few backwaters where chattel slavery really does still occur). Chattel-slavery is as stupid as it is immoral: the slaves have no motivation to work any harder than they think is necessary to avoid a beating, and it's a bad idea to allow them to realize that they're slaves.
A sneakier thing is to create systems that hide the reality behind a complex facade, which includes the debt Mike mentioned, welfare programs, fiat money and credit systems, capital-depletion mechanisms (such as inflation and taxation), public indoctrination cum "education", and so on.
I take this very seriously as well. Watching what predominantly money changers, IMF, federal reserve and complimentary structures for differing areas. coupled with the attempt to take over the entirety of the food systems, pushing it into what is in reality a un sustainable, and not even superior in the short term system... (although centralized control, the farmers are serfs on their own land) control of info, literally creating realities, in a complex structure, of indoctrinated tenure, to science with agendas(i.e. complying for funding and other ways) a vast control grid is being formed. reality itself being created. Many believe it, many more wouldnt notice either way, and a few like us who see differing aspects of this structure, even if we may disagree on its purpose intent, or destination. I am left to conclude the worst case scenario actually is 1984 ish. heck we are there all ready, its jus not compulsory yet...... all it would take is the majorly controlled financial or food systems to crash, and a generation of degraded conditions for it to be compulsory, or nearly so. desperate people do what they are told. their children having grown up in it, will know no different.
I have plans for a wide range of scenarios. among the most extreme is growing foods, people do not readily know are foods. wild grains, berries most do not know of, wild type greens, (oaks are a good one for that also, being highly edible with processing, but most would never think of it) and the like.... the reason being is there could in time be a play to hinder or limit personal gardens. It sounds extreme now, but in 5 or 10 or 20 years, it may not.
and to DAME...... working to own your own future is not slavery. It certainly can take a good amount of work to take even just the basics of owning your future into your hands. the most basic being food production of which I assume you are referring to. But this actually offers un paralleled freedom. you are indebted only to your own destiny. If a large enough chunk choose to do this, as the world keeps turning, many more may indeed choose to do so...... we will empower ourselves. We may also be in positions to offer actual solutions to any issues we face, rather then the purposely created cause and planned for effect scenario we seem to be in....... What percentage would it take to be looked on as a true alternative to the plans I feel are being orchestrated? Impossible to tell, but it may be less then we may assume depending on how things play out.