Just to be more clear. I recently spent on a decent office chair from Staples and a wide office desk from Ikea, which really allowed me to work productively for long hours from home. I also have got 2 wide screen monitors that really span across my table, and helped my productivity (though it might be subjective). Another example of things that can indirectly affecting productivity could be a good bed - helps you sleep well but indirectly affects thee quality and productivity of work during the day.
What can be other furniture or 'things' that can aid people work productively?