Answer:
Debit Bad debt expense   $19,000
Credit Allowance for doubtful debt   $19,000
Explanation:
When a company makes sales on account, debit accounts receivable and credit sales. Based on assessment, some or all of the receivables may be uncollectible.  
To account for this, debit bad debit expense and credit allowance for doubtful debt. Should the debt become uncollectible (i.e go bad), debit allowance for doubtful debt and credit accounts receivable.
Where a debit that had previously been determined to have gone bad gets settled, debit cash and credit bad debt expense.
Amount that may be uncollectible
= 4% *  $600,000
= $24,000
Given that the Allowance for Doubtful Accounts has a $5,000 credit balance before adjustment, the additional amount to be adjusted for
= $24,000 - $5,000
= $19,000
 
        
             
        
        
        
This is also known as the three duties towards the customer DAD Dealing with Honesty. Accounting for all funds and Disclosing the material facts to the buyer.
<h3>Who is a buyer?</h3>
A buyer is a customer who purchases the goods and or services of a company through which the company generates the revenue and earn profits. The buyer plays a key role in the development and running of a company.
The buyer should be allowed to have all the information about the product or service it is going to purchase, the buyer should be informed about the market rates and the demand of the goods as this is a material fact about the product. 
Therefore it is a duty that a seller owes to the buyer to deal with honesty that is not charging high price if they are unaware of the price of the product.
Learn more about Buyer at brainly.com/question/27282505
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It is becoming a global center for it, computer programming, and software.
        
             
        
        
        
Answer:
They have increased the importance of production economies of scale.
Explanation:
Flexible production allows the manufacture of different types of products in the same industrial production line. This makes companies lower costs by avoiding tool change, time savings, and industry structure.
This type of economy fits into the description of economies of scale. Economies of scale are those where the increase in production results in a decrease in the average cost of the product. Increasing production - by including more products on the production line - without a proportional increase in the factory's installed capacity leads to a reduction in the average cost of production, ie it is an economy of scale.