Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 3 · Name Letters and Chakras
युद्धजयार्णवः (चक्राणि)
लक्षयेन्मासि मास्येवं यद्येते स्युश्च चैत्रके ।अलंकारादि संगृह्य षड्भिर्मासैश्चतुर्गुणम् ॥ २ ॥
In the full Agni Purana this is chapter 129, verse 2.
Watch for these every month. If these signs show in Chaitra, collect ornaments and the like. In six months they give four times their value.
Simple meaning: If the signs show in the first month, store ornaments. They can bring four times the value in six months.
वैशाखे चाष्टमे मासि षड्गुणं सर्वसंग्रहम् ।
Signs in Vaishakha: store goods for a sixfold gain by the eighth month. Store grains in Jyeshtha and Ashadha.
श्रावणे घृततैलाद्यैराश्विने वस्त्रधान्यकैः ।
Ghee and oil in Shravana, cloth and grain in Ashvina, and grain in Kartika can bring a gain.
पुष्ये(पौषे) कुङ्कुमगन्धाद्यैर्लाभो धान्यैश्च माघके ।
Saffron, scents and grains bought in their months can bring gain. This ends the section on prices.