Advertising and communication help in announcing the arrival of new products and their uses to the people.

(1) Lack of double coincidence of wants
(2) Non-existence of common measure of value

Cholas had a strong trading relationship with Chinese Song Dynasty.

The role of the state in trade related to two aspects namely adequate infrastructure to sustain the trade and administrative machinery for taxation.

Boats like 'Kalam', 'Marakalam', 'Vangam', 'Navai', etc., were used for crossing oceans for foreign trade.

Boats like 'Padagu', 'Thimil','Thoni', 'Ambu' 'Odampunai', etc., were used to cross rivers for domestic trade.

Alauddin Khilji and Sultan Balban were the important kings encourage the import of foreign trade in 16th century in North India.

In 16th Century Delhi, Mumbai, Ahmedbad, Sonar, Sonargoon, Jaunpur and Lahore were considered as important trade centres.

According to Kautilya the important aspects focused by a state are treasury, taxation, industry, commerce, agriculture and conservation of natural resources.

i) Boats like 'Padagu, Thimil, Thoni, Ambu, Odampunai' were used for domestic trade.
ii) Boats like 'kalam, Marakalam, Vangam,Navai' were used for foreign trade.

The place where the goods were sold was called "Angadi".

(i) Producers and traders may not have the required funds at the time of their need.
(ii) The problem of finance affects the producer, trader and the consumer.
(iii) This Hindrance is known as Hindrance of Finance.

The night market was called as Allangadi.

Day market was called as Nalangadi.

Barter system refers to a system where "Goods were exchanged for goods prior to invention of money".