By far the best single source I've encountered on the revolution in Spain is The Spanish Revolution by Stanley Payne. It's a really compelling and well-researched analysis of the roots of revolution in Spain (especially Catalonia) and the nature and dynamics of the revolutionary state after the start of the civil war. There's a lot of economic detail and analysis in there. I'm at work so can't consult my copy right now, but I'll break it out and check back in when I get home.

A couple of notes in the meantime:

• if you have JSTOR access, 'Catalonia and the Spanish Civil War' by E. Allison Peers provides a good quick-read overview of Catalonia's position and role in the war.
• the question of whether collectivisation of industry and agriculture was successful (in productivity terms) is a very vexed one; there's significant debate over whether collectivisation (and specifically collectivisation as it was carried out by the various left-wing, anarchist and syndicalist factions at work in Catalonia in 1936-37) was effective either as a mode of operations for a war economy, or for a prospective Catalan state in the long term.
• inflation was a serious problem in Catalonia during the war: Michael Seidman claims that "Prices in Catalonia rose 6-7% every month [during the first year of the war]." (Source: 'Agrarian Collectives during the Spanish Civil War'.)