Factors that cause the differences of mark-up levels among selected sari-sari stores in Tacloban City by Abud, Gladys D., Accion, Melody Jane, Agang, May Catherine T., Baclayo, Hazel T., Batingal, Cecile Evemary S., Beniga, Madel Sandy Novem J., Ching, Jerome B., Estur, Marianne Lei C., Napoles, Adele Sheila A., Sabornido, Maricris D., Uraga, Patima, Vacio, Japhet L., Villotes, Visabelle G.