Auxiliaries to Trade:
All activities that facilitate smooth flow of goods from manufacturing centre's to the consumption centre's are called auxiliaries to trade or aids to trade. Auxiliaries to trade may be classified into five categories.
Transportation :
(1) Selling the goods produced at or near the production place is not possible.
(2) Hence, goods are to be sent to different places where they are demanded.
(3) The medium which moves men and materials from one place to another is called transport.
Banking :
(1) Bank is an organization which accepts deposits of money from the public, withdrawals on demand or otherwise, and lends the same to those who need it.
(2) Business activities cannot be undertaken unless funds are available for acquiring assets, purchasing raw materials and meeting other expenses.
(3) Thus, banking helps business activities to overcome the problem of finance.
Insurance:
(1) Business involves various types of risks.
(2) Factory building, machinery, furniture, etc. must be protected against fire, theft and other risks.
(3) Materials and goods held in stock or in transit are subject to the risk of loss or damage.
(4) Employees are also required to be protected against the risks of accident and occupational hazards.
(5) Insurance provides protection in all such cases. 
Warehousing:
(1) Usually goods are not sold or consumed immediately after production.
(2) They are held in stock to make them available as and when it is required.
(3) Warehousing helps business firms to overcome the problem of storage and facilitate the availability of goods when needed.
(4) Prices are thereby maintained at a reasonable level through continuous supply of goods.
Advertising:
(1) Advertising is one of the most important methods of promoting the sale of products, particularly, consumers goods like electronic goods, automobiles, Soaps, detergents, etc.
(2) Also there is a need to persuade potential buyers about the uses, quality, prices, competitive information about the goods and services, etc.
(3) Advertising helps in providing information about available goods and services and inducing customers to buy particular item as.

(a) Analytical Industry :
Analytical Industries analyses and separates different elements from the same materials, as in the case of oil refinery.
(b) Genetic Industry: 
(1) These Industries remain engaged in breeding plants and animals for their use in further production.
(2) The seeds nursery companies, poultry, dairy, piggery, hatcheries, nursery, fisheries, apiary, etc. are classic examples of genetic industries.
(c) Construction Industry:
These Industries are involved in the construction of Buildings, Dams, Bridges, Roads, as well as tunnels and Canals.
d) Extractive Industries:
These industries extract or draw out products from natural sources. Extractive industries supply some raw materials that are mostly products of geographical and natural environment.

The following are the characteristics of Commerce.
(i) Economic activities:
(1) All economic activities are undertaken to earn Profit. commerce deals with all economic activities undertaken for profit.
(2) So, commerce is concerned with all economic activities directed towards earning profit.
(ii) Exchange of goods and services :
(1) Commerce involves an exchange of goods and services for profit.
(2) Goods may be produced for the purpose of resale to the consumers.
 (iii) Earning motive :
(1) Profit is an incentive for undertaking all commercial activities.
(2) Any activity, which does not have the incentive of profit, will not be a part of commerce.
For Example: If a trader gives some goods as Charity.
(iv) Creation of Utility:
Commerce creates form, place and time utility in goods.
(v) Regularity of transaction:
The transaction should be regular. No isolated transaction will be a part of commerce.

Comparison between Industry, commerce and Trade

Basis	Industry	Commerce	Trade
(1) Meaning	Extraction, reproduction, conversion, processing and construction of useful products.	Activities involving distribution of goods and services.	Purchase and sale of goods and services.
(2) Scope	Consists of all activities involving conversion of materials and semi-finished products into finished goods.	Comprises trade auxiliaries to trade.	Comprises exchange of goods and services.
(3) Capital	Generally large amount of capital is required.	Need for capital is comparatively less.	Small capital is needed to maintain stock and to grant credit.
(4) Risk	Risk involved is usually high.	Relatively less risk is involved	Relatively less risk is involved
(5) Side	It represents supply side of goods and services.	It represents demand side of goods and services	It represents both supply and demand
(6) Utility Creation	It creates form utility by changing the form or shape of materials.	It creates place utility by moving goods from producers to consumers	It creates possession utility through exchange.

On the basis of size or scale of operations industries may be classified as follows:
1. Micro Industries
2. Small Industries
3. Medium Industries and
4. Large Industries
Under the Micro, Small and Medium Enterprises (MSME) Development Act, 2006, the above types of industries are defined as follows.
1. Micro Units:
A unit wherein investment in plant and machinery is upto Rs 25 lakhs in case of manufacturing and upto Rs.10 lakhs in case of service enterprises.
2. Small Units:
A manufacturing unit wherein investment in plant and machinery is more than Rs. 25 lakhs but does not exceed Rs. 5 crore. In case of service enterprises these limits are Rs.10 lakhs and Rs. 2 crore respectively.
3. Medium Units:
A manufacturing unit wherein investment in plant and machinery is more than Rs.5 crore but does not exceed Rs.10 crore. In case of service enterprises, these limits are Rs.2 crore and Rs.5 crore respectively.
4. Large Industries:
A manufacturing unit wherein investment in plant and machinery exceeds Rs.10 crore. In case of a service unit investment in equipment exceeds Rs.5 crore.