Paul Samuelson, author probably the most widely read over the decade. Published since 1948 in something like twenty English language editions, heaven knows how many non-English language editions. Timing not so great - 1989:

The Soviet economy is proof that, contrary to what many sceptics had earlier believed, a socialist command economy can function and even thrive.

It is vital, folks, it is vital (...) to laugh at the mainstream. They talk about their predictions but the biggest prediction of the 20th century they're four square, full-set, dead-set wrong.

Chris Leithner "The Science of Human Action"