Small is Beautiful by EF Schumacher
A paeon to wisdom, is how I imagine this 1973 'Study of Economics as if People Mattered' as it is subtitled. I haven't read it yet, though bound to have a copy waiting somewhere on my shelves. This is the Abacus 1974 edition, from a 79 print run. The pages are a little bound, the cover a little scuffed and foxed, it is lovely.