1. Discuss some examples of products or services that requre a critical mass of potential buyers be equipped and weling to buy through the Internet. 2. Describe the challenge for businesses surounding return-on-investment calculations and employee recrutment and retention. 3. Discuss the difficuity of integrating existing databases and thansaction-processing softiware dosigned for tradionat commerce into the software that enables electronic commerce 4. Discuss some aspects of cultural and legal obstacies to conducting all fypes of electronec commerce