As you might imagine, the Roman Economy is a gigantic topic with hundreds, if not thousands, of academic works devoted to it. I can give you some general recommendations. Some are on amazon for a reasonable price; others you will have to get from an academic library, probably.

First, for the ancient economy in general, Finley might interest you. Read his little biography first, then the book -- it is dense, but not long. There is a new edition of the original (from the 70s) with a great introduction by Prof Ian Morris (now at Stanford).

Finley, M. I. 1999. The ancient economy. 3d ed. Sather Classical Lectures 43. Berkeley: Univ. of California Press.

Another general book I have to recommend is The Corrupting Sea. This is probably one of the most influential publications for the subject in the last 20 years, if not the last 50. It is not always an easy read.

Horden, P., and N. Purcell. 2000. The Corrupting Sea: A study of Mediterranean history. Oxford: Blackwell.

From a review of The Corrupting Sea:

Horden and Purcell’s account displays some distinctive features that are worth drawing out. First, it focuses not on single traits and stable properties but on relationships and interconnections. This is truly an attempt to think history in the relational mode (relational, not structural: the term ‘structure’ is conspicuously rare), to avoid the enumeration of unrelated ‘factors’ and to reconstruct interrelations. This is obviously of particular importance when seeking to avoid the usual dichotomy of nature and society. It is not the given landscape but the perceived, human landscape that is invoked; not the sea but the way it has been used, traversed, and observed. But the same holds for other issues: It is not a single cultivar or a striking invention which explains change but their varying combinations, and so on.

Horden and Purcell characterize the Mediterranean in terms of the combination of three elements: the exceptional fragmentation and variation of its landscapes (‘microregions’), the instability and unpredictability of its climate, which requires strategies for coping with persistent risk, and a remarkable tradition of interdependence and communication made possible not only by the sea but also by the particular configuration of its landscapes. Combining the three, they come up with a definition of the Mediterranean in terms of the unpredictable, the variable, and, above all, the local (13). This may seem paradoxical, but as the book unfolds the approach not only makes sense but gradually reveals its fruitfulness. The authors reject both an ‘interactionist approach’, privileging exchange and commerce and focused on the sea, and an ‘ecologizing’ one, which questions the exceedingly mobile image of Mediterranean people by relegating them to local communities tilling the land in pursuit of subsistence with their backs to the sea. Instead, they ask us to think both at once — to see as distinctively Mediterranean the combination of interdependent local microecologies and an exceptionally high degree of ‘connectivity’

Another one I can recommend is:

Scheidel, W., I. Morris, and R. Saller, eds. 2007. The Cambridge economic history of the Greco-Roman world. Cambridge, UK: Cambridge Univ. Press.

This has individual chapters on various topics in ancient economic studies, so you can pick and choose based on specific interests.

Finally, if you want a specifically Roman coverage, you might check out:

Bowman, A., and A. Wilson, eds. 2009. Quantifying the Roman economy: Methods and problems. Oxford Studies on the Roman Economy. Oxford: Oxford Univ. Press.

This examines different aspects of the quantitative approach to the ancient economy and/or standards of living.