Marie Biscarra, co-owner of ISSO fashion boutique in San Francisco, writes a sign declaring her business open for curbside delivery on May 18. Retail sales jumped a record 17.7% last month.

Marie Biscarra, co-owner of ISSO fashion boutique in San Francisco, writes a sign declaring her business open for curbside delivery on May 18. Retail sales jumped a record 17.7% last month.