A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of the text. It clearly states that Barbie dolls show globalisation. This is an overview of what the text will discuss. It does not refer to any previous information, so it stands alone. Why other lines are not chosen? Paragraph 2 starts with "While" which is a conjunction, so it cannot be independent. Paragraph 3 does not stand alone because it refers to the label of the doll without introducing the topic first. Paragraph 4 uses "This" which is a pronoun that refers back to something, so it is not independent.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the main idea of the text. It uses the phrase "This makes it a truly global product" which shows the conclusion of the discussion about Barbie dolls and globalisation.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects with Paragraph 1 because it gives details about the manufacturing of Barbie dolls. It explains how the costs changed over time. This shows a logical order from the general idea of globalisation to specific details about manufacturing.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects with Paragraph 2 because it continues the discussion about where Barbie dolls are made. It shows the result of the changes in manufacturing costs. This is a cause and effect relationship.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects with Paragraph 3 because it summarizes the information about where Barbie dolls are made. It shows that the many countries involved make Barbie a global product. This is a logical order from specific details to a general conclusion.