Barcelona has more shops per inhabitant than anywhere, from chic boutiques to chain stores. Dedicated shopaholics should come during the two annual city-wide sales—from the second week in January to mid February, and from July through August. Just look for sale signs (rebajas, or rebaixes in Catalan).
Non-Europeans spending a lot of money in one place can get much of their tax refunded when they leave the EU; shops that participate have a tax-free shopping sign in the window and can fill you in on the paperwork.
As a general rule, smaller shops open Monday to Friday from 10am to 2pm and from 5pm until about 8pm. Small shops also tend to close on Saturday afternoons; some close all day on Monday. Nearly all are closed on Sundays.
High-end designer boutiques and luxury shops are concentrated along the Passeig de Gràcia and vicinity: come here to find the likes of Hermès, Bulgari and Chanel.
Image by matze_ott