Introductory, but necessary - markets are the most relevant-less discussed topic in political philosophy.
The first part - a descriptive analysis of markets and a comparison between the marginalists and the classical political economists -, though less philosophical, is extremely enlightening. We already get a large chunk of the argument there. Namely, the point that markets are not neutral, innocuous, and desirably universal. Markets are not all the same, they are radically heterogeneous, and should be treated as such. They are also not natural or autonomous, they are founded on sets of social practices and assumptions that keep them standing as we experience them. Markets are also not just preference-fulfilling/aggregating, they shape them as well - by the range of choices they offer and by the outcomes of their workings. Markets thus construct and de-construct people and relationships, they have large impacts on the development of agents' capabilities, and analysis of their desirability should not neglect this.
Satz actual argument is not a very clear or definite one. What she's aiming at is an attempt to bring to the discussion of markets some basic normative ethics, some consideration of other values other than efficiency. The discussion on markets has been so poor and one-sided that a project as unambitious as this must be seen as having great merit.
Going beyond efficiency, Satz establishes 4 parameter to characterise a market as noxious - weak agency, underlying vulnerabilities, harmful individual consequences, and harmful societal consequences. If any of them verify, a market must be significantly regulated or forbidden. She adds to this schema the relational egalitarian notion that states must assure citizens the background conditions for them to relate to one another as equals. The result, or the implications, are strong social-democratic policies (supply in kind of many basic goods), and thorough market regulation in markets like labor, organs, financial services, prostitution, etc. Actual forbiddance is only suggested for surrogacy and child labour (this one tentatively only).
These not-so-radical conclusions should not be seen as a compromise or failure. What they, and Satz, reveal is that most of the problems with noxious markets derive not so much from the fundamental logic of their working, but from the circumstances in which they are embedded. Destitution and subservience, gender and racial discrimination, inequality, etc. are fundamental sides of all non-abstract markets, and skew them ineluctably. Adding more market to these markets will only deepen such problems. Establishing a society based on relations of equality - assured by granting universal access to basic goods and by dismantling oppressive structures - should be our number one priority. For this to verify, people and relations must be insulated from the nefarious sides of markets, not left increasingly more expose to them, or "responsibilized", as neoliberals contend.